TLJ certainly has the emotional/narrative heart of the trilogy, but it’s worth considering that ESB has a similar role in the OT - ROTJ “only” adds the throne room scene as far as character development.

The hardest thing about adding anything to TLJ is that it is already overstuffed with worthwhile character development and story; ideally you’d be adding a 5th act to a 4 act movie.

These are the two ideas that came to mind, might be too much though.

-There is a conference room scene about the state of the galaxy in TROS that I wish was in TFA, like the one in ANH. It has a different kylo mask and the exegol fleet, so it likely wouldn’t have anything left once you cut that out.

-What if the fleet arriving at exegol could be used? What if they actually answered Leias call in the end? It would be hard to work it with the millennium falcon front and center…

Regardless, broom boy is the ending to the trilogy for me.