I said this in another thread but I would've had the trilogy like this:
-There's no Empire, no First Order, no Trade Federation, no droids, and no Storm Troopers. All the enemies are lightsaber wielding Siths and Knights of Ren. I know that's a big change and Stormtroopers/Clone Troopers are so recognizable in Star Wars, but there's really no need for them here. Save them for the anthology films and shows.
-It would start with the Knights of Ren being the main villains. In my vision they would be the zealots/religious extremists, who think the only way to truly bring balance to the force is to kill all the Jedi and Sith. They believe instead of light and dark, there should be no absolutes. Only shades of gray. Because of that, they are hard to track using the force. The force doesn't really register them as a disturbance because in actuality they are a balance between light and dark. There will be a similar amount of them to how many Jedi there are. This mixes up things a bit, but still keeping a lot of elements fans love and are familiar with
-Lupita Nyongo would play the big bad/main Knight of Ren. Mostly because I'm still mad what they did with her in the real Sequel Trilogy
-I guess it kinda would have to take place 30 something years after RotJ. Preferably it'd be only like 10 years, but with the cast's age...
-The galaxy will be at peace. No major wars or anything like that.
-The Jedi have rebuilt a lot, but they're still relatively small. Less than 1000 jedi. They're not the size they were in the PT. Mostly because, with the galaxy at peace, Luke doesn't feel the need to have a huge powerful force like the Jedi.
-There will be a new Jedi academy and even a new Jedi Council. Obviously Luke will be leading it.
-Obviously Luke, Leia, and Han will be in it. All 3 will share a good amount of screen time. Luke will be leading the Jedi, Leia will be a politician, Han...idk. Can't really think of anything for him. Maybe like a pilot trainer for the New Republic Army. But he for sure will be there.
-Lando will be in this a lot more too. Alongside Han, probably be an instructor or something. Or maybe an ambassador.
-Rey and Finn will still both be in it. They will both be Jedi apprentices/padawans at the cusp of becoming Jedi knights, early 20s. Ben Solo will be in it as a Jedi Knight around 30. He'll be an instructor at the Jedi academy. I don't think Poe will be in my idea. There's no reason for him.
-Rey and Finn will be completely platonic, brother and sister type stuff. Maybe MAYBE Rey has a little precocious thing for Ben. I guess you'll need a love story in this trilogy and that could kinda be it. But it will be completely one sided.
-Rey will not be related to anyone important. Neither will Finn.
-Rey would be the more wild, brash, headstrong one and Finn would be the straight man. Like Rey's the one who is always ready to buck the system and do what needs to be done, Finn always argues but goes along because he wants to support his friend. Classic cliche character dynamic but still.
-So the plot kicks off that very recently (last couple months) throughout the galaxy Jedi are disappearing. No one is sure what is happening. Everyone assumes the Sith are returning, but Luke isn't so sure that the Sith are doing this. The Sith are returning, but they're dormant and just waiting for a chance to strike.
-Yadayada stuff happens, Ben disagrees with Luke staying so calm about everything. Luke probably doesn't want to go into battle where people will be killed unless he's sure about something.
-Then about halfway through the film, Ben goes off on his own to investigate what happens. Maybe one of his best friends ends up disappearing so it's more personal for him. Rey and Finn secretly follow
-Ben pulls up on a planet and sees a Sith and chases him down. Assuming that he's the reason for Ben's friend disappearing. Eventually they start dueling. Ben wins, but the Sith reveals that he was running from Ben because he thought Ben was the Jedi hear to kill them like they killed his other Sith brothers.
-This is when the Knights of Ren are revealed. 2 of them will be on the planet. They kill the Sith and almost kill Ben until Rey and Finn join the fight.
-Somehow we learn the KoR's motives blah blah blah. Some other stuff happens. The movie ends
-Episode 8 takes place a year later: Long story, less long:
-There's a war going on throughout the galaxy. Jedi vs Sith vs Knights of Ren
-Ben near the end of the movie sides with the KoR and is anointed as Kylo Ren
-Ben/Kylo kills Han
-The climax of the movie will have the Jedi academy destroyed, due to Ben's help. A large amount of Jedi are killed
-Rey and Finn get separated in the escape
-Rey is rocked to her core with so many of her friends dying and her mentor (perhaps crush/love) becoming a murderer.
-Luke manages to escape
-Episode 9 takes place 3-4 years later
-Jedi are kinda against the ropes.
-Sith have been completely wiped out (not permanently, but still)
-With the death of the council and so many Jedi killed, the Jedi are kinda aimless. There's no organization
-Luke hasn't been seen in a minute similar to TFA. He's hiding on some planet.
-Finn and Rey haven't seen each other or spoken since the escape from the Jedi academy
-Kylo and the KoR are doing their thing
-Finn finds Rey on whatever planet and gets her out of her funk. Finn is trying to rally all the Jedi for one final stand
-Finn, Rey, Lando, Leia, Chewie, C3PO, R2 go to find Luke. They find him living that hermit life similar to TLJ
-Rey gets angry at Luke thinking he abandoned them. And that he can't do that because he's supposed to be the best of them yadayada. But it turns out he retreated because he knew he had the biggest target on his back and he needed to formulate a plan. It was difficult for him, but it was the best chance for the Jedi to win
-So Luke finally comes up with this plan. The KoR are defeated. Kylo tragically dies (no redemption). Luke dies similar to TLJ. Finn and Rey survive and the galaxy goes on
Basically that's it. I didn't expect to write that much, but yeah. Obviously not fleshed out. I don't know where big space battles that you expect from a Star Wars Episode would fit into it. How are the Knights of Ren so well trained? I haven't the foggiest.
But yeah that's my basic not fleshed out idea for where they should've gone.