Well, I’d say find something else interesting to do. I’m not sure if this is replacing one addiction with another. But maybe you can find something healthy to do. And replacing a behaviour with something else is probably easier than giving it up and keeping a ‘hole’ there.

Changing one’s behaviour isn’t easy most of the time. But certainly possible. The other commenters are correct. You’re not missing out by not spending time on youtube. Also keep in mind, social networks, youtube etc are meant to be addictive so you spend your time and attention there, so they can make money.