Some things that I would change were things that I believe were pretty clearly being hinted at in ‘The Force Awakens’ but were not picked up on for VIII and IX. Rey was clearly being touted as a Skywalker, possibly Luke’s daughter. Finn and Rey had romantic feelings for each other, and Finn had potential to be a future Jedi. The are lots of other tweaks I would’ve made (the biggest is bringing Palpatine back, truly the ‘jumping the shark’ of the SW universe), clearly the movies suffered from not truly having the entire story mapped out, but letting each director kind of ‘wing it’ as they went along