Add a baby to the mix. Suddenly you've got more human interaction than you can imagine in a given day.

FWIW, I've been married the whole time I've been a freelancer, and the loneliness didn't settle in until year 5 or so. Your spouse will probably not want to talk shop all the time, and those types of conversations (tech, business, etc) were what I missed the most. But maybe I'm just excessively sensitive!

I've found tech meetups scratch that itch a little bit but I'm 2 years into remote (with a wife and 2 kids) so maybe more is coming... Just curious if you tried that and if it worked or not for you?

I've only started going to tech meetups recently, as an attempt to socialize. It's definitely helped! I basically avoided it for the first 6 years, so I'd recommend it very much.

When I was freelancing full time I would go to a share office 3 days per week.

My wife works too, but not at home, so...

It was cool during school breaks to have my older kids at home. Cool during lunch. Not so cool when I had to break up disagreements.

It didn't get really bad for me until I'd been at home 5 or 6 years.

I second this. I've been freelancing for about 2 years as well and I don't feel lonely because I'm married.