kbin.social/u/@potus you can follow him via this link (anyone else on other kbin instances, just adjust the link to your instance, assuming you aren’t defederated or if it isn’t bugging out atm on your server it should work)
Remember that federation is currently one way with threads. You and other fediverse users can see your own replies and boosts etc on their posts and interact with each other, but no one from threads can see your interactions or replies to them.