Timeskip. Rey levels up using the book. Ren has trouble ruling his empire.

Luke's Force Ghost haunts Ren, possibly Rey as well.

Unlikely but interesting: Snoke and Luke ghosts being the angel and devil on their shoulders.

Rey v Ren duel ends in draw, both knocked out. Rey rescued by friends, Ren killed by Hux.

Possible: Knights of Ren v Rey's new trainees.

A new Rebel fleet shows up from somewhere. Most of it is slaughtered yet again.