Helping governments and societies become, well, nicer.

I'm curious what ideas are out there for helping societies, or people in general, become nicer.

This paper - https://grabbyaliens.com/ - is an interesting deeper dive into how humanity seems early on a cosmological timescale, and a mathematical model of expansionist civilizations expanding to fill the universe.  Many common themes with this piece - particularly regarding the Fermi Paradox - plus some more to think about.