I had the same addiction. Using cold turkey or every site blocker helped me break this addiction. I paid for the premium version and I'm happy than ever, even because I use it also for porn. On my other devices: an iPhone and an iPad, I got a screen time blocker setting. My dad knows the password and I set youtube and many other time-wasting apps to a limit of 1 min usage every day. That worked, no more youtube for me.
I actually see 88991s' point, because one of the biggest addictive aspect of YouTube is the endless scroll and recommendations. By downloading only the specific videos you really want to see, you remove the recommendations aspect. I'm personally a big fan of this method, with everything else I do to curb my YouTube consumption, it's a really nice plus that helps me differentiate being online from binging YouTube
I dont know why our brains insists us for doing such a things that seems to be waste of time or useless and get addicted so easy, i think it's because the easy those things that can be done and lack of self awareness and self control that we should learn it over time.