I'm looking for specific and non obvious answers. Give me something visceral, rid the world of a figure or nation you hate. Preserve a culture you adore. It doesn't have to make sense either, you are basically god here.
What I mean is don't just say you'd get rid of imperialism or colonialism bc no shit
Personally I would make it so that the Americas are never discovered by the old world and every would be conquistador (especially cortez and pizarro) explodes.
Not exactly sure how but I'd try to preserve knowledge from all over the world. If humanity was able to constantly knowledge instead of rediscovering everything every couple hundred years we'd have FALGSC by now.