Just saw that Disney wants to do another trilogy past Ep.9
A thought...
By Ep. 12, they should find out that some odd power is coming from the death star II, so they have to go explore the thing. Like, the WHOLE ENTIRE movie is them exploring it, since Return of the Jedi really showed a star in the background going supernova and wasn't really the death star blowing up, it just looked like it from the camera angle.
So then the heros find out that this odd power is coming from the hypermatter reactor...AND....it turns out that Palpatine being thrown in by Vader and the rebels shooting it, then encased his body in a super power projective energy barrier if some kind. In Rise of Skywalker they cloned him and his spirt transfered to that body, BUT NOW, his spirt has reconnected to his orginal body that is supercharged and hes back stronger THAN EVER!!!!
(Ok, yeah, that is a stupid wack idea that sadly makes more sense than, "somehow palpatine returned". Don't let anyone from Disney read this.)