This is answering the wrong question.
You're answering the question, "In a loneliness epidemic, what can I do to be less lonely?" Your answer is to use self discipline (which is hard) to get out of your house consistently, a decent answer to that question.
To actually fix the loneliness epidemic, you'd have to get everyone else to do that.
In the 20th century, getting out of the house consistently was the easiest way to interact with other people. Now, you can interact with lots of other people (in a less satisfying way) without leaving your house. What's going to fix that?
How do we get everyone to eat better? How do we get everyone to get enough sleep? How do we get everyone to exercise more? "Just tell them to do it" won't work. "Why don't we all just put our phones away?" won't work. We'd need a policy.
(My best guess: in the US, mandate that health insurers pay for therapy, and provide therapy at low/no cost in countries with national health care.)
100%. Telling people they just need to work harder and do better feel like good advice but it isn't going to solve a population scale problem. Sure _you_ should do it because it's the only thing you can directly control, but also understand it isn't going to solve the problem an entire society is facing.
In the 20th century you left the house because otherwise you were bored.
I love being alone but I am not "lonely" and I am never bored.
When I go for a walk on a beautiful summer night in America, always alone, there is rarely anyone outside. They are in the house, mostly alone unless they have a partner/kids.
I think we have a loneliness epidemic because we have a culture that makes it fun to be alone. Some people don't like this level of being alone but many do. Those that do aren't really going to pitch in to help so I am not sure what the solution is. You can throw a party but I am not going to show up. I would rather be alone. This is enough interaction. There is also a culture of narcissism, hyper stimulation or both involved I imagine. I can't just close the browser window in person if the conversation seems boring or jump to something more interesting instantly. I would even say that being alone is more fun now than hanging out at someone's house in the 20th century. There is just so much more to do. The group was less bored together but it was still pretty boring then. That is why going to the bar was so popular. Not much else to do then besides get drunk and smoke cigarettes in groups to get rid of the boredom.
I was with you up until you said policy was the solution. No, action must come first. Policy needs people to agree on it, and can take a long time to enact. Action can be done now, and allows experimentation and disagreement. I am looking for actionable solutions that I can experiment with as one lone individual with time to spare on Sundays.