The biggest servers are gathering lots of people. I hope they're entry points, not destinations, and people use them to build their mental models of the fediverse and shift their account (you can port your followers!) to strengthen smaller communities.

Some servers already gathering tech policy people appear to include
tech.lgbt
eupolicy.social
mamot.fr
climatejustice.social
fosstodon.org
infosec.exchange

Feel free to reply with more to help others navigate (& join, cogovern, donate to them)!