Hiking, reading (paper books!
), (team) sports, cooking, gardening, going out with friends, visiting museums/exhibits, …
I think one thing that might help, and would also probably give occasions for new relationships, is having a dog.
Edit: @PhilMongoose helping at animal refuges, taking care of grandchildren if any, do-it-yourself, … the list is infinite. I would say, go to a public library, go through the alleys and see what topics appeal to you (to then add into your life). There are plenty of hobby books about all sort of things (cars, planes, sports, sciences, hobbies, animals, origami, robotics, crochet, the most exquisite sorts of teas and what biscuits pair well with them… whatever you may think of, really).
If the question is more about getting rid of our dependency on digital life, I’d say building home habbits (no screens in bed, eating sitting at the table with no screen, etc.) helps. I’ve pondered going hard with a time switch on my internet, in order to cut it off at a said time in the evening.
Edit 2:
I think that’s a big part of the problem (that I have, at least). Too often, we don’t do things or do them in our usual way not by lack of knowledge but by lack of action. We expect an outside solution while actual improvement would mostly require working on ourselves and doing the thing.
As said, I’m very guilty of it and trying to do better.
Edit 3: On that last point, I do recommend the strangestloop essay about doing the thing (spoiler alert, planing to do the thing isn’t doing the thing - and watching Youtube videos about doing the thing isn’t it either). Read here by Chris Williamson: