How would I fix the prequels? Slowly build up the relationship between Padme and Anakin, as well as Obi Won and Anakin. Not just a we don't know each other to we are best friends/lovers.
Have the personalities of the characters of the prequels slowly evolve to resemble those of them from the older movies. How did Anakin become a leader of the Sith in the older movies when at the end of the prequels he was an emotional wreck and still very impulsive. How did Obi Wan change from a front line soldier to a wise sage? You don't have prequels that end so fractured from the original films. Prequels are supposed to make you feel like you know the whole storybut with Star Wars there still seems like giant chunks of the middle of the story is missing.
*Edit*
Oh, and have the story far more character driven. Having it politic driven was absolutely freaking BORING!!!!







