One of the biggest disappointments of this trilogy for me is that not only does it end with the galaxy in pretty much the same situation it was in after ROTJ, but it punted Luke’s role of rebuilding the Jedi to Rey’s generation – and EVEN THEN, did nothing with it. No fanedit can fully correct that, but I do have an idea for possibly mitigating it somewhat: transform the final scene into a gathering of Rey’s first class of Jedi students:

Film new footage of a handful of people igniting lightsabers in the desert (matching & integrating it with the Rey footage would be challenging, but it’s conceivable).
Add spirits of more Jedi Masters either beside Luke & Leia or behind Rey, to suggest that she’ll be aided & guided by a “Force Jedi Council” of her own (even with a time skip, Daisy Ridley is pretty obviously too young to start teaching on her own, & it would be nice to keep Luke involved in the New Jedi Order).
Cut the “Rey Skywalker” exchange (which I’m personally fine with, but it simply wouldn’t fit with this version).