It's a very common feeling and I'm no stranger to it as a solo game developer. But remember that the "grass is always greener on the other side". Chances are that, once you go back to the "nice job" at the end of the day, you'll miss the peace and ownership of your solo building days.
I always enjoyed chatting with my coworkers and learning from them. I do miss that. But I don't miss anything else from that environment, to be honest.
I've been remote and essentially on a solo projects even though I work on a team with 50+ offshore devs that it physically pains me when I have to get on a call and talk with coworkers.
Yeah, if it serves OP as consolation I've been in full time employment 9 yrs. Sick of 'socialising' and I'm building my own thing with 0 people to take with me. I need full agency, I'm done with death by thousand feedback. The grass is indeed greener and I'll probably miss working with people... in 2-3 years. We'll see.
I always enjoyed chatting with my coworkers and learning from them. I do miss that. But I don't miss anything else from that environment, to be honest.