IMO mass unsubbing is the wrong response to take if you want a good YouTube experience. The best way is the opposite: subscribe to EVERYTHING you like even a little bit, and then use the Subscriptions page as your home page. Ignore the real home page, ignore the algorithm entirely. I've done this and the irritation is gone.
I stay logged out, and use a private session when I go to YT. I keep a home page of bookmarks to content creators I enjoy content from, linking to their main page, and either follow one of those links in to see what they've posted lately or go to the home page for YT, ignore everything, and search for something specific. If I run into a new content creator I like, I add them to my bookmarks.
I started this for privacy reasons, but I really like it now because they don't know enough about you in a private session to mess with you, and their search is usually good enough to find what I'm looking for. There is then a golden period where the recommendations are actually useful that lasts for maybe a dozen videos or so after which they try to psychoanalyze you too much and then it's time to kill the old private session and start a new one.
I've gone from being anti-privacy to being anti-privacy and anti-algorithm both.
