I created an app that allows you to find people from other Mastodon instances based on hashtags you both like.
https://bitbra.in/tootpal
It's still a bit buggy, I hacked it together in an hour - but it gets the job done.
Mastodon is the best way to keep up with what's happening.
Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.