Did you check out Mastodon's current solution? Scroll a bit down and you'll see that you can filter through the servers based on your language and interests, a

Did you check out Mastodon's current solution? Scroll a bit down and you'll see that you can filter through the servers based on your language and interests, as well as see the amount of users each server has. https://joinmastodon.org/ https://joinmastodon.org/