I don’t know how I’d improve on the lightsaber battle. I had some ideas the other night about how Rey might appear to Kylo Ren near the end. The image in my mind was that Rey could take on a more menacing appearance as a result of channeling what is pretty clearly the Dark Side, and Ren is so taken aback by this that he cedes ground to her in surprise and fear. But it’s not a priority for this edit, since I think it was done fairly competently in the original version.
That actually sounds like an incredible idea. Anything to give us more reason to believe that she would beat Kylo.