Adobe After Effects or Nuke (and Blender or similar) are going to the sort of things you’ll want to look in to for fixing continuity errors, changing lightsabers and the like. More experimental tools like EBSynth could also be useful. For making things higher resolution, Topaz Video Enhance AI is your best option short of recreating the elements from scratch. Adobe Premiere or DaVinci Resolve are the most common consumer tools used for cutting together video.

I don’t believe it’s possibly for consumers to put together Atmos mixes yet, so if you’re going to alter the actual runtime of the movie (add, remove or retime shots such that the audio needs changing), you probably won’t be able to maintain the Atmos mix because it won’t be in sync anymore. Ditto for changing Yoda’s voice and things like that.