What Disney should have done was a straight remake of the OT with a new cast and modern CGI.
It would have made at least as much money, they had a great excuse to do so, and it would have given them a much younger cast to work with over the next twenty years.
Then, at the same time you are dealing with that, you use Disney Plus to release multiple TV shows set around the OT time period. Basically ten years before to, say, twenty years after.
Use a collection of relatively new and unknown actors and lock them into TV contracts as well and them, post the release of the third movie, drop a show in the five to ten years afterwards focused on the actual downfall of the Empire and the rebirth of the Republic. Actually, do it with a few shows. Have one be a Jedi focused show around Luke trying to rebuild the order and track down/deal with the Inquisitors. Have another be a political thriller focused on Leia and Mon Mothma establishing a government/dealing with the politics with Han as Leia's love interest and the dirty tricks man (probably with Lando involved as well).
Those two shows are kept separate but kinda like the MCU Netflix shows where they are in the same universe and do interact with one another.
Might also throw the Mandalorian is there as well. Have it taking place maybe five years post Endor at the most. Boba Fett could also work in the same time period.
Keep Jedi numbers down, probably have Ashoka as one of the leads of the Jedi show and be the one who really rounds out Lukes training. Make it so that Force Sensitives with enough power to theoretically be a Jedi are rare; as in a million or so in the entire galaxy. Most also need to start training young, those able to come to the Force late in life and excel being even rarer. The Force is also something best taught one on one and the new Jedi only have a handful of potential teachers and you are generally looking at twenty years to get someone properly qualified to be a Knight (and closer to forty for a proper master, on average).
If the Sequel Trilogy is still supposed to be at least basically similar to what we got then have Ben kidnapped as a baby/young kid in the Leia/Han focused show. Drop a few hints setting up the ST more broadly as well.
I would tie back into the Prequels and all the CIS droid run infrastructure as the basis for the Final Order. Palpatine kept copies of all of the Empires technical plans and R&D squirrelled away out there and starts rebuilding.
Have Rey be a project from one of Palpatine's cloner's in the immediate aftermath of Endor and before Palpatine's spirit could make its way to his fallback point and reconstitute himself. The cloner swipes a genetic sample and gets herself pregnant with "Palpatine's Son" in an attempt to claim the throne, fleeing out into the galaxy. Only she dies in childbirth and Rey ends up misplaced on some backwater for whatever reason.
Rey taps into the Force instinctively for whatever reason. Probably the Dark Side to save her life and this alerts Palpatine to her existence and he orders his agents to recover her. Cue the first movie. Probably have Rey flee to the Jedi and maybe a reunion between Ben and his family as he chases her down.
Palpatine realizes that secrecy is over and unleashes his fleet. It's Clone Wars 2.0 except Palpatine has the Clones and Droids on the same side.
Have the second movie be Luke, Ben, and Rey using Ben's knowledge to try and resolve the problem while Leia is being being the head of the Republic and fighting a major war. Maybe with the Republic allied with some Imperial Remnants who really don't want Palpatine back.
The second movie ends with Luke dying doing something suitably epic and saving Rey and Ben's lives. Maybe fighting Snoke before proving that "size matters not" and telekinetically holding an entire fleet in place so that they can escape before crushing the whole fleet? Or perhaps saving a world by simply tanking a superlaser shot (don't you know, the power of the Death Star is insignificant next to the power of the Force).
Have the third movie end with Ben eating Palpatine's spirit and them becoming one with the Light side of the Force, utterly eradicating the black soul. Probably with Rey pregnant with his kid. Maybe have Ben fight Palpatine for control and Palpatine keeps drawing on more and more of the Dark Side with Rey calling up the Light side spirits to oppose him and channeling that power into Ben?
Regardless, the movie ends with Palpatine quite thoroughly dead, the Sith properly eradicated (until someone finds a holocron or Force ghost or whatever), and the torch having been passed to a new generation.
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Regardless, plot the ST and the surrounding media before you do anything. Create a cohesive story for the galaxy going forward to whatever time you want the ST set in and figure out how to get from Endor to the ST time period in a manner that makes sense and with the "lesser" media telling the story. Ideally also leaving enough space for smaller expanded universe content in the time period in between.
I probably also would have paired it with another SWTOR type game except its set in the immediate post Endor aftermath. Use that to really tell the Warlords story, the collapse of the Empire, and the formation of the various successor states (with the Republic being basically first among equals).
Thrawn would be an interesting story to tell, but I don't think it would work as a movie or even really as a TV show. Probably do that as a video game somewhat in the vein of Mass Effect except with you playing a kind of Kyle Katarn role as a smuggler who can work with/help either/both sides. With the "canonical" ending being the Thrawn loses ending.
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If you want future media projects after that, go back to the Old Republic and tell the story of Revan. Have the initial three movies be the Mandalorian Wars. Movie one starts with him breaking with the Council and going off to join the war. Use it to build up the characters and mostly have it as an action movie with massive battle scenes and Revan (and friends) proving himself the military genius and leader he became known as. Have the movie end with him being given Supreme Command of the Republic military.
The second movie is where you start to see Revan's path to the Dark Side as military duty conflicts with what the Light side is all about. Orbital bombardment, necessary sacrifices, collateral damage, etc. Revan learns war with the Mandalorians as his teachers and the battlefield as his school. The movie ends with the Mass Shadow Generator being conceptualized.
The third movie (with some time skip) is the movie of the final campaigns. Revan deceives a large portion of the Mandalorian fleet into Malachor with Meetra in command and Revan & Malak leading a commando strike on Mandalore the Ultimate's ship. Revan kills him in single combat and rips knowledge of the Sith Empire from his head.
The second series of Revan movies starts with him returning from the Unknown Regions as a Sith and tracking down the Star Forge. It ends with Revan's fleet departing from the Forge to start his war. Kreia and the Triumvirate are also brought in.
The second movie is Revan's campaign, culminating in Bastila capturing him.
The third movie is Revan's redemption. When the Jedi try to wipe his mind, they instead wipe out the compulsions that the Sith Emperor planted in his head and Revan just pretends the wipe to have been successful (chiefly to avoid having to retread the Star Maps). Bastila is kidnapped and Revan tracks down Meetra and some of his old companions, probably meeting up with her right before she goes after Nihilus, and recruits them. The assault on the Star Forge happens with Meetra taking on Scion while Revan and Bastila (freed from Malaks brainwashing) are engaged with Kreia. Meetra joins up with them and it becomes a Meetra & Bastila vs. Kreia fight while Revan goes off to kill Malak.
The third movie ends with Revan, Meetra, and some of the crew heading off to the Sith Empire. Bastila left behind because she is pregnant and to prepare (along with Carth and Canderous) for the war to come.
The last three movies are that war. The first one is an infiltration of the Sith Empire. Done more as a "spy" movie with Revan's party setting the lesser Sith at one another to buy time, destabilize the Sith Empire, and get into a position where they can make a go at the Emperor himself. It ends with Revan triggering the Sith/Republic war by deceiving a Sith into ramming a major Imperial fleet into a prepared Republic fleet that has Bastila and her battle meditation in it.
The second movie follows an advancing Republic fleet under the command of Carth and Bastila (and being fed intelligence by Revan via his bond with Bastila) moving on the Empire while also following Revan preparing his strike.
The third movie ends with Revan ordering Bastila to glass Dromund Kaas while he and his party keep the Emperor locked down. Meetra's Force Wound nature protecting the party from whatever powers of the Emperor allowed him to easily beat Revan last time around. This victory, the entire campaign really, was incredibly costly to a still recovering Republic and while it ends with the Sith capital glassed, the Emperor dead, and a lot of the Sith fleet wrecked the Republic isn't in a position to push for total victory.
The Revan series of movies is supposed to have a very different feel to the originals. They are supposed to be full blown SW war movies at the height of the Jedi and Sith. Galaxy spanning war between peer competitors show in all its horror and glory. The Force unleashed in a way that the Skywalker story never really allowed for. I'm thinking a scene in the Revan's Sith Campaign movie where he unleashes Nihilus on a heavily populated world, reads everyone's minds to find who will be a problem, and then uses Nihilus to life rip all of the offenders from orbit before moving on. Or where Scion is atomised, only for his body to reform in a swirl of dust with him laughing as he walks out of a crater caused by an orbital strike.
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Those would have been my SW plans if I had Disney resources and acquired SW.
