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.
if we're dreaming, how about preserve and spread the apparently egalitarian urban culture of the bronze age indus valley civilization or any similar culture as a hopefully proto-socialist mode of production that dominates until industrialization allows for proper communism, perhaps largely bypassing slave-based, feudal and capitalist stages if a ruling class based on ownership of people and private property fails to really take hold.