What’s your proposed alternative for flourishing, content, joyful human lives?

There's humanism, but it didn't take off. I don't know if this analysis even gets to the root of ... the alleged problem. I mean, OK, lets say (other) people are miserably lonely and need to join some kind of club: they won't do that anyway, even if it's a church-like club that promises to tell them what life's all about. Possibly people already form communities as much as they honestly want to.