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dance moves, or other stuff I don't find very interestingThere are lots of different corners of TikTok, and for good or bad it's generally pretty good at forming some fairly niche communities. I have a couple of primarily dance-oriented creators I follow—none of them teenagers, fwiw—but the most interesting are the ones who use their platform to educate, whether it be about science-y stuff or music or history or whatever; I've learned a lot from following a substantial group of Black creators who've taken the time to talk about their lived experiences. These communities with somewhat deeper content really took off when the platform opened up 60 second videos (I gather that was late in 2020?) and they've mostly gotten even better now that creators (at least some of us?) can make 3-minute videos.
It's all based on what you like and follow, though. Very early on, it's worthwhile to go out-of-band to track down names of a few creators that you can seed your for-you-page with, otherwise you'll get the lowest common denominator stuff. Sometimes someone will "duet" or "stitch" another video and then you're introduced to another creator and can follow them directly; other times the FYP itself will serve up someone you've never seen or heard of but that has content (and presumably like-and-follow patterns) similar to the ones you do follow. And then you can like and/or follow the new person.
I mean, there's thirst traps too. If those were the only videos you liked, then that's what it would show you.