Original clunky title: How do ActivityPub instances’ people initially find remote instances’ people/communities/channels/etc. to vary their feeds?
Given that an instance won’t see remote instance’s people and stuff to follow/subscribe to until someone there has found them and followed/subscribed…That’s generally how ActivityPub works, isn’t it?
Just surf along the information superhighway and keep an eye out for tasty links. You’ll soon get the hang of it. Here’s one place to start: https://mastodon.social/public/remote