Riding bicycles alone isn't going to help; its going to take decades of urban planning to fix the last 60 years of mistakes.
Maybe look at it as joining a community, not specifically being about cycling. Being a cyclist gives you something in common with someone else that you can talk about it and, when doing it, it's rather visible. A running club, writing group, etc. can be similar.
I'm a transportation cyclist, but I don't think being a cyclist has measurably increased the number of friends I have. It did give me something in common with quite a few of my friends, but I didn't meet any of them through cycling. For a while I tried joining a cycling club, but I found that I didn't have much in common with racing cyclists.
Being a cyclist did however does apparently increase the number of people who seem willing to harm me, unfortunately. That's not loneliness, but it's not good either.
"The United States is in some ways becoming a medieval society, in which people live and work in the modern equivalent of castles--gated communities, apartment buildings with doormen, and office buildings with guards--and try to shield themselves while traveling between them. They do this by riding in sport-utility vehicles, which look armored, and by trying to appear as intimidating as possible to potential attackers." - Keith Bradsher
https://www.theatlantic.com/science/archive/2017/11/suvs-and...