>>906481tons of stuff.
don't change major history moments because it would maybe end my existence.
If I'm immune to the paradox I would first prevent a lot of stuff like ww1+2, 9/11, Kennedy assasination, make Hillary win, make Russia win the cold war etc. to see what would have happened.
Then I chose the ideal timeline and use my demigod powers to rule this world as the very first president emperor of planet earth and then the universe.