Free edit idea (that I’m planning to use):
The sequence where Kylo touches Vader’s helmet, Rey trains, and there’s flashes of various images is just all over the place. To simplify, I’ll cut it down to just the images that relate to Rey, not Kylo to give some focus and imply this is where Kylo learns about Rey’s past. Then move the flashes of Kylo’s past (Han, Luke) to when his mask is being rebuilt, as a way to give some sort of explanation as to why he’s even doing that (his past is still haunting him, the mask is a shield). I’d probably also emphasize the flashes of Rey turning him down, so it’s almost like he can’t stand to face her.