I guess you joined a crappy instance. The Explore feed on my instance is freakin' awesome and full of a constant stream of interesting and enjoyable posts by cool people. Mastodon isn't very optimal when you join the biggest instances on the network (like mastodon.social or similar). The tech is best experienced with invite-only communities of people who agree on a basic set of standards for their social experience.
Social media is at its best when it’s just stuff from people I choose to follow or know.
How do you discover new people? I'd say some people I followed I discovered them thanks for the feed