I go back to my original suggestion. People are not going to come knocking at your door.
For instance, I go to the gym. Groups of people go at the same time and you see friendships form as they work out together and do things like races. Some work a few hours at the gym.
Golf, bowling, hiking and biking clubs, people who get together to root a sports team, gardening clubs, people who volunteer to organize the parades, rotary and lions clubs, the possibilities are endless. We have a biking friend who was single and childless, whose lovely wife died of a horrible cancer, who worked Saturdays at the local bike store. It was a perfect transition to his retirement as he was doing what he loved. Now he works part time after retirement and heads a charity to recondition donated bikes for disadvantaged teens. Some people docent at historical houses, gardens museums and so on. DH joined a model train club. A bunch of old guys playing with trains. He loves it. I belong to a quilt guild and work on my clay at a pottery studio. I am in heaven.
I volunteer at at the library one or two days a month. I cannot tell you how many older men hang around to talk to the volunteer on duty (there are two of us a day working the used book rooms.) . They are just plain lonely. I suggest they volunteer there and several have. They just didn't think of it.
Here's another thing. Dissatisfied with the current or past government? Find your local political party group. They are always looking for boots on the ground to make calls, fund raise, drive people to polls.
If if you try something and don't like it, don't do it again. Try something else. Baby steps.
Imagine what your life would be like with no phone, no TV, no computer. What would you do all day?