I'm not a fan of the things proposed by 80000 Hours or other smartest people. There's a lot of people who said that AI would be the most important thing to work on, and those people ended up using AI for evil in the end.
Plus it assumes that survival or suffering are the highest priority things, but there's a lot more other things like community and civilization.
Take Kant for example and go improve yourself, as the only part of the world you can really change.