So I have this theory. I am not going to develop it much here but Carl Jung and Freud et al are responsible for all the greatest time travel stories.
Time travel is always used successfully when used allegorically to represent not moving on but physically going through regression therapy into the depths so to speak.
Examples – Back To The Future, Endgame, Star Trek (Multiple examples) – Voyager finale.
Not accepting defeat, the mistake of the past.
I am not a good writer, I don’t have the patience… just an idea. Maybe when I have written down them all I can stitch them together into a beautiful Tapestry… or a better person can try.