My feed is programming jokes, math/science videos, Hamilton, lots of cats and sometimes very strange combinations of the above.
One impressive moment was, around when the new Animal Crossing came out, I immediately started getting a ton of AC content, almost half of my feed, and when I stopped playing, less than a week later I was basically not getting any at all.
If you don't like what you see on TikTok, you need to press your screen a couple of seconds, then select "I'm not interested". It takes a couple of hours before the algorithm filters all the content you dislike.
And when you see a lot of similar vidéos (a "trend"), use the "hide the videos with this song". Most of the time, all the videos from a trend use the same music.
(I only have videos of dogs and DIY...)