In my Rey Nobody concept, we need to believe that Palpatine ‘wanted Rey dead’ because he saw her future. Part of my way of accomplishing this will be to make Rey have a clearer vision of herself on the throne, but I just had the thought that it’d also be cool to have a Palpatine voice over during this: “I’ve seen your future. I know your power will be too strong to control.”
I also really like the idea of Rey following up “I’m all the Sith” with “I’m no one.” There’s a shot where she grabs the other saber and we don’t see her face, so you could potentially have her say “I’m no one… and I’m all the Jedi.”