Human's are social creatures - do whatever it takes to get some face time in with someone near by.
Something which may or may not apply to you, is that in the past, I also felt quite empty, simply because software development had become my entire life from sunrise to sundown. Once you realize your entire identity is based around one thing, specifically work, it's quite jarring to realize and hollow that is.
I've watched everyone else slacking yet I'm the one under review. It makes no sense to me. But it's not the first time and not the first supervisor to do it. I just happen to be the one who has to deal with it all. I had to sign something at work from HR stating I would improve. It's definitely one-sided when they take your supervisor's word over the ability to work efficiently enough to pull in the most amount of jobs and do the most amount of work. I'm still confused by it, but the one thing I'm still glad about is the remote work.
When my supervisor recommended I return to an office, I refused and let her know that would cost double salary + half to deal with other people, their germs, and risking getting COVID. But I'm positive that this too, shall pass. Like I said, not the first time I've been under review. I am just "that guy" that brings out that "power struggle" in every supervisor, and they always feel the need to exert that dominance over me. That's happened for every job I've ever had.
Keep a few side projects handy. Keep doing your best. I recommend joining a gym especially one with a pool and a sauna and a jacuzzi just to get yourself out of the house and doing something other than staying at home. It helps to feel that you are "doing something" and might even improve your chances of meeting people, socializing, or at least being around other human beings.
[1] https://calendly.com/taylor-town/30min
It's impossible to tell from your short description, but you also might be encountering early stages of depression. Consider chatting with a therapist.
Yes I have been in the same boat and being unemployed was better for my mental health than staying in big tech (as long as you have savings to float you)
How long are you working daily? More than 8h is wrong wrong wrong.
Rest, relax, get out.