My version of the Jedi would be more decentralized and scattered throughout the galaxy. They’d be like the Dunedain Rangers from LOTR, and would be more low-profile and not really in the public eye. Obi-Wan would be a general in the service of House Organa of Alderaan, but it wouldn’t be a normal thing for a Jedi to be a general.

I’d delete Qui-Gon entirely and merge all his character traits into Obi-Wan. Obi-Wan discovers a 19-year-old Anakin on Tatooine. I’d also incorporate Owen Lars into Anakin’s life on Tatooine.

The Clone Wars would start in Episode I, and would be multiple conflicts spread throughout the galaxy, and the clones would be attacking the Republic. Mandalorian clones, maybe.

I’d give Tarkin a role in the prequels, and show his rise to prominence.

And most importantly, I’d spend a lot more time fleshing out Anakin and Obi-Wan’s friendship and making their bond compelling. Also, Padme would live at the end, and Anakin would fall into a lava pit in a way that Obi-Wan can’t save him.