That won't be as easy as you think. Again, how would you do that if monetary incentives are mostly gone? If nobody is poor enough to help with evil plans, evil plans become really hard.

Heck, add in another simple rule: make all wealth information public. If nobody is poor and nobody really rich, there won't be much incentives to abuse that information and if we know peoples worth, it will be glaringly obvious that somebody is cheating

I know that this is an obvious oversimplification bit small changes like these areuch easier to implement than say "let's all become anarchist and the world will be fine!' because that will never happen.

These small changes keep everything else the same and at least it solves a huge list of problems from people dying from hunger to most crime to most wars to climate change. All of these mentioned are mostly only possible because we allow extreme wealth.

Take extreme wealth away and the world would be so much better