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.
Fossil fuel deposits are more evenly distributed and whatever hasn't been burnt by 2025 are rapidly less recoverable. Maybe zap those gas hydrates out of existence while we're at it.
It's really quite rude to give the hairless primates the tools of industrialisation and extinction in one hit.
Make central Australia a bit deeper, with a sea connection to the northern and southern coasts so the interior can stay forested.