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.
OK we're keeping Paleolake Megachad and seeing what happens
Why this specifically? I don't know the historical context this lake other than it being big
If we're doing alt history why not change something big? The timeline of human civilization would probably be unrecognizable. Alt history is usually about small changes so let's try producing something very novel.