What I would like to see:
Kylo Ren not turn to the 'light'.
Maybe disown the name Kylo Ren because he finds out the other Knights of Ren work closely with the Emperor.
Palpatine didn't keep Kylo close because he sensed the 'light' in him and feared another Vader situation (betrayal).
Snoke was a pawn of Sidious and his fears (obviously) became reality.
Ben Solo kills the Knights of Ren to earn/force status as Darth Sidious' new apprentice (his temper could easily fuel this).
Maybe "The Rise of Skywalker" as Ben uses it as his surname, instead of Solo, because he loved Leia and was trained by Luke.
Maybe Palpatine created Rey to be the next Vader, and that's why she's such a Mary Sue...?
Ben wants to kill Rey, but Palpatine thinks he can turn her more than him (despite his desire to be dark side), so he interferes?
Ben kills Sidious because he's sick of all the Dark Side drama and want to be the King of Evil.
Rey kills Ben and the Dark Side is officially dead. To keep the balance, Rey has a Force Aneurysm and join the other Jedi in death.