If you're still interested in technology for its own sake, quit your job (assuming you have the savings, mental health, and self-discipline to do so), or get a

If you're still interested in technology for its own sake, quit your job (assuming you have the savings, mental health, and self-discipline to do so), or get a job at a company that doesn't think it owns all your work on your own time (unlike Google), and originate or (nontrivially) contribute to an open-source project. If it gets adoption, that could help you find more interesting gigs in the future. If you're really ambitious, you could try to start a company around your project (but that's not good advice for most people). Otherwise, find a non-tech hobby as others have said, and remind yourself just how good you have it compared to 99.99999999% of the rest of the world.