It's bad I can't say that I did it with willpower alone but Brick helped immensely. Their product is great, not a subscription, and even though there are competitors or you could build something like this for your phone, they're good with customer service and I would recommend their product.

Also, Unhook for removing suggestions/comments/etc from Youtube, you can basically turn everything off until it becomes a search bar and your subscriptions.

Get a good website blocking browser extension. Remove anything that resembles a "recommendation" or avoid it like the plague.

https://getbrick.app/