This is kind of the fundamental question of philosophy, right...? How should we live? What is the meaning and purpose of live? What constitutes a good live?
For me, I take a somewhat existentialist approach to life. I think we have to find subjective meaning and value in an inherently absurd and chaotic world, full of too many people who same to only care about themselves. Corruption, religion, politics, cults, corporations, money, conspiracy, lies, bullshit, random acts of violence and hate--all of these things are so senseless and arbitrary, we'd go crazy trying to make sense of it all.
So I choose to value my family, friends, art, music, hanging out, eating good food, chilling out, using open technology to benefit my life, as well as living virtuously as part of trying to be part of a good society.
So far, I've tried and enjoyed:
And there are still plenty more that I haven't really tried yet! The fediverse is pretty huge!
As for recommending specific sites, that's a bit harder since it's healthy that not everybody is on the same server. So I would just recommend picking a reasonably popular server with open registration.