Disable history.

When it is disabled the yt screen will not contain any recommendations and will actually be empty. After you do this, you'll find yourself dozing off to yt on occasion and reaching a blank screen only to realize you didn't actually come to watch something specific but more as a force of habit and you'll lose the trigger. I recommended this to a couple of friends of mine and they all say it worked wonders.

I'm not sure if you only have to disable history or some other options as well, but basically you want a blank screen when you reach yt. You can still have subscriptions, but the idea is that you intentionlly look for what you want to watch instead of having the yt screen recommendations offering videos and you choosing.