In addition to the above, I would also kill Poe early in TFA as originally planned, as I feel he got in the way of Finn’s character development. Rey was supposed to be the new face of the Jedi, and Finn was supposed to be the new face of the rebellion.

I would also leave all the “Finn as a Jedi” red herring stuff out of the TFA marketing and make it clear in all the trailers, posters, etc. that Rey is the new Jedi.

Furthermore, I would tweak the ending of TFA a bit to show Luke already dressed in rags and sulking when Rey finds him, so that it’s clear from the moment we see him that he’s a broken man and not really a Jedi anymore.