I’m sorry to hear that because I had similar problem but clearing cookies & cached web content option ended up working for me. Hope you find something that work because it was awful to experience ads after so long. I track stuff I subscribe to with TubeSync but still like to search for new topics & the ads were annoying.
Working at a college its always shocking finding out a lot of the youth don’t know ad blocking at least. Volunteering after my shift to help with tutoring or other help they will try to show me a youtube video even on their personal laptop. Every start of a semester its something that leaves me shaking my head.