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.
give the native americans horses far earlier by way of the viking settlements in canada
Having access to horse domestication would have done a lot to advance the development and size of native american civilizations. Beasts of burden in particular to help with nomadic migration and agricultural exploitation.
they also did so well as horse riders in our timeline they made rifles obsolete and made the empires invent the revolver just to combat them. and thats with only a century of horse domestication. Give it to them far before european settlement and theyll be able to put up even more of a fight.