Youtube is just using ML algorithms so it's only going to be as good as the data you give it. Actively downvote and choose "Not Interested" for content you don't like and anything click-baity.
They are now organizing suggestions into topics so you can easily curate simply by hitting the X on topics that you don't like.
Of course, you need to clear your search and watch history too, otherwise all those clickbait videos you clicked on before will still be driving your suggestions.
"$7,000.00 Beta Starter Opened with OpenBoosters - BLACK LOTUS?" investment scam?
"MY $1MILLION DIAMOND INVESTMENT" mm Im seeing a pattern here
"Flat Earth: What Makes REAL Science? – Wisecrack Edition" wat?
Not to mention 10 out of 20 suggestions are videos I already watched and upvoted (I inject custom CSS into YT to make :visited visible again so I can skip it).
Getting shitty clickbaity/scam suggestions is not a given/reproducible, but they still happen often enough to be noticed on a daily basis.
So with that factor removed, my search/watch history actually seems to be driving cleverer selection of videos to recommend, not worse.
sadly this is not the case, you will still be flooded by "10 of X, you wont believe number 3" and "person Y stumped liberals with his totally not nazi speech" garbage