I believe a few things need to be changed:

1 – No DJ, Rose, or Canto Bight – I truly believe we are adding too many characters and not developing them enough.
2 – Luke dying needs to be the ending, rather than the slave boy.
3 – The Yoda scene was rather awkward, and confused the lore on how Force Ghosts could interact with the universe.
4 – Remove the porgs, for the most part.
5 – Give Snoke a line of dialogue about his backstory, but keep the momentum of the throne room scene.
6 – Maybe remove the line about Rey’s parents, but I am fine either way.
7 – Change the title of the movie to remove the word ‘Jedi’ altogether.