Have you ever tried reading e-books? I've replaced most of my "on break" or "during commute" social-media time with plain reading of long-form content.
I tried that, and it didn't work for me because it's just too easy to switch to another time-absorbing app if the phone is already in my hand.
But I did something similar: I started reading actual books.
The key was to buy used paperbacks for $1 from low-end bookstores. That way I can carry it around and not worry about it, and if it gets lost or damaged, no big deal.
When I'm done with it, I leave it on the bus or train for someone else to find.