With an account on panthermodern.net you'll be able to follow people on any Mastodon server and beyond.

This is a invite only community. You'll have to ask me or other members currently residing here. Once in, you can invite whomever you wish, just remember their behavior reflects on you as well, so choose wisely... If you have an invite, good on you! But if not you can probably reach out to me at seven@panthermodern.net and sooner or later I will get to you, and maybe just grant access...