We can start by picking low hanging fruit.
As someone wrote earlier, things were pretty great economically in the U.S. when the super rich were taxed as they were in the 50’s/60’s. We don’t need more Musk stinking up the place or Trumps destroying our democracy. Same with corporations.
Getting control of the population would help our species greatly as we run out of water and many other resources. This means, of course stopping the religious right from banning abortion and birth control. Fewer people means less pollution.
Change our political system so that the rich don’t hold all of the power. Oh, and get rid of the electoral college.