> My feed is disastrous.
I've tested this many times. Your feed has what you watch. If it's disastrous, that's because that what you actually like to watch.
Stop watching a topic and it will go away. About 2 months later YouTube will offer it again to see if you want it, if you don't it goes away again.
I don't watch baby content. Somebody at home does, so youtube offers me that. No, we don't share accounts. No, we don't share devices. Sometimes youtube offers me Chinese and Indian content, and ads.
I seems your feed is more consistent than mine.
It adds some amount of "proxy content". But right-click or long-click and block the channel on the stuff you really don't want. Also if you watch a video you thought was interesting but it was lame, go to history and remove it.
And finally if you regularly watch stuff subscribe, it's a strong preference indicator.
I do get some junk in my feed now and then, but mostly I discover good stuff I enjoy. And that includes really small channels.