This isn’t really a re-write idea as such, but I’ve been thinking recently: to me the sequel trilogy as part of the ‘Skywalker saga’ feels like a bit of an unnecessary add-on, partly because it calls back so much to the original trilogy instead of taking a more natural next step. George views the original and prequel trilogies as one entity, the complete story of Anakin Skywalker; I don’t really see it that way, but why don’t we run with that and make the sequels an openly new saga of their own? Hell, even make it a 6-film long epic. Something with the scope and scale of the prequel and original trilogies combined, but told in a linear way and meticulously planned out from the start.

A few very vague rewrite ideas but I might do something with at some point:

Luke is still vanished for some reason at the start of the story but we see Rey and Ben training together under Leia’s tutelage. They would be close friends, maybe even secret lovers.
The responsibility placed on Ben’s shoulders by Luke and Leia is immense and he struggles with it. At some point in the first film he experiences visions calling him to the unknown regions and journeys there, where he finds remnants of the Empire having built up their forces in secret, ready to welcome him as the heir to Darth Vader. He is given a chance to choose his own destiny and takes it. The Imperial remnant becomes the First Order.
The First Order would be one of two sets of villains, probably taking hold of the galaxy because Ben believes such a militarised and authoritarian regime would be the best way to combat the main villains. Different to Darth Vader, he genuinely believes what he is doing is right - becoming a dark side user, he must also be driven by anger or grief at a loss due to the main antagonists. He takes on the name Kylo Ren but protagonists like Rey and Leia refer to him as Ben throughout the story.
Rey doesn’t struggle with heritage so much as having to be Ben’s replacement as the ‘new Luke Skywalker’. I think at one point she would join him as a dark side agent but eventually regret it and would have trouble seeing herself as a good person again.
I have no thoughts regarding who the main villains would be. Genuinely clueless. As I said, these are ideas that really aren’t fleshed out in any way which I’m just throwing out there.