I've wondered about that. My job isn't spectacular, it's pretty good. I used to want to strive for a spot in a bigger/high impact/significant company like Amazon or Apple for example, but eventually came to realize I'd probably never do anything interesting there, even if I was capable of it. I don't know. I used to feel like I missed the boat and my career would never be as rewarding because of it. These days... Starting to feel like I'm actually doing alright, making the most with what I've got.
I stopped pursuing that career direction because I'm geo-locked, so to speak. I can't leave this city.
Anyway, sorry you're having a terrible time. I've been there. I hope the situation improves soon. Maybe you should bank everything you can, take time off, then get back to finding work with a fresh mind. Good luck.