I have been thinking about this a lot too. My solution is more low tech.Humans are designed to live in communities but modern communities are very isolating. My indian friends in America live in a close knit indian community and live next to each other. I've noticed that they don't suffer from same social isolation as other americans do.

My solution is to scale this to everyone, A housing colony with community kitchen and hangout areas. More like a less intense urban co-op. This is probably also a solution to healtcare crisis in america, healthy food + social belonging == well being.