I don't even really use the "For You" tab.
I stick to the "Following" so I can see the content that I want to see by the people I want to see it by.
The "For You" tab can get a little off the rails if you start clicking on others profiles and it ends up sort of changing the algorithm. But even for me, it's more so just sports news under that tab.
I think the problem is however I used it for 10ish years was absolutely no big deal, if it was suggesting stuff I had no issue and the suggestions seemed in the ballpark of what I was looking at, sports if I was reading up on sports news etc. Then overnight it's just spamming me with stuff that's very often exactly the opposite of what I want to see and stuff I think is borderline criminal. I'm sure I could've figured it out but it just seemed like a really ugly thing so why reward that sudden change? It wasn't benign happy stuff and it usually had absolutely nothing to do with the other topics I was trying to follow.