Personally, I did quit Facebook, after years of less rewarding interactions, and an increasing amount of friction with the site. Often the newsfeed's choices of content felt personally insulting. It's a habit to visit, even though it really doesn't offer much, like smoking.
What I did is I change my password to something that I don't remember to break the habit. Then, in the time it would take to recover the password and sign in, I have already remembered that I don't want to. I haven't been there in a couple of weeks, and the last times I did, my notifications were quite dull.
One thing that reinforces quitting is that not using the site for a while seems to greatly reduce the reach of posts when you return. When I post content and get no responses it feels humiliating, like I appear to have no friends who are interested in my content. In reality, Facebook is showing my content to very few people. I get about 10 times the response on Instagram, from basically the same group of people, and it was even more so before they partially ruined Instagram by making the feed more like Facebook.