I haven't joined any social networks so I don't know how quitting those will work out for you. However, at some point I found that I was reflexively using my smartphone to read irrelevant stuff, watching dumb videos, checking whatsapp for new messages etc. just to kill boredom. I did not like how addicted I had become to that habit, so a couple of years ago I bought a simple Nokia phone without an internet and ditched the smartphone. There is a certain spartan feel to it, and to be honest at first it was kind of rough, but now I have adjusted. When boredom strikes, I just don't do anything. It doesn't bother me as much nowadays. By ditching the smartphone I also lost the ability to listen to music or podcasts when outside home, but surprisingly I haven't really missed those. Same thing for email, gps, google maps, looking up random facts etc. Somehow I have just managed without them? I'll call or text someone if I have something urgent to say, which is surprisingly seldom.

For me it has worked out well, but YMMV.