Hiking helped me a bunch, I suspect any combination of sunshine and exercise would have helped, but that helped me. It also helped by allowing me to be a guide of sorts for old friends I had lost touch with, who were looking to step their toes into nature.

Find a hobby, find people that do that hobby, and talk to them in the real world. Maybe don't even try to get anything else from them except conversations about that hobby.

Get used to going out alone, goto the diner, movies, concerts, the beach. Just being out around people is huge. I think the sneakiest downside of remote work is the lost of all the little human interactions you get from being out. Things smiling at someone while holding the door, or getting annoyed at someone for not walking fast enough, is huge.

We are not meant to be alone all the time, even if you hate people, its still good for you to remember why you hate them.