I also agree. Personally I loved The Last Jedi, but it’s a fact that this movie resolved the internal struggle in Rey when one movie still had to be made. She accepted her lack of famous ancestors and she refused to join Kylo.
Palpatine has been a tool to add another (weak) struggle. The only other would be to have Rey kill her parents (that’s why she fears herself), but some of us already tried that and the result was never really great.
That’s actually a good idea. What if she used the Force instinctively to try and stop her parents from leaving and destroyed their ship. A memory reactivated when she thinks she’s killed Chewbecca.
That way you wouldn’t have to change much. Extend the flashback from the Force Awakens and add the ship held in midair before exploding. Use this as memory flashes after the Force lightning scene. So when Kylo Ren taunts her she understands he isn’t lying.