My fyp is not showing me what I want

I first noticed this last year, at the end of 2023 I started watching Doctor who and therefore started watching content about it on tiktok, and until halfway through last year I was get a lot of Doctor who content, good. But then it slowly stopped showing me videos about it even though I was still engaging with them and I followed a lot of DW accounts until I just stopped getting any sort of content about it all together unless I actively searched for it, and in the low chance I did get anything it's just "cheap" content (e.g. clips of the show instead of edits and stuff like that). And know, even when I lookup Doctor Who and spend like an hour watching things I'll get maybe 1 or 2 videos for a day and then nothing again. AND I EVEN POST DOCTOR WHO CONTENT!!! And now I'm starting to noticing it happening again with my "newest" interest, i started watching F1 last year and watching videos on tiktok but now it's starting to show me less and less content. And it's not like I've done anything like accidently hit the "not interested" or something like that, I genuinely don't know why this happens or what can I do to fix it.

(Forgive me for any grammatical errors, English isn't my first language)