If you're happy with the pay/location, work less. Most people really only have a few hours a day of full-on productivity. A large part of many jobs is station.
Maybe teach or do something so working less is less obvious, because that would be noticed. But get a life, something that lets you enjoy moving around and engage with people who aren't part of work. It's very, very unhealthy to just work. And don't forget, the only 'reward' for being a committed worker in this situation is more work. You will be taken for granted.
A lot of comments are about becoming an "actual" 10x developer. But that's contextual. If you're solving problems for a company or people you care about, great. Otherwise, tech comes and goes, keep the focus on quality but otherwise it's unlikely there's much meaning to "better" work unless you're creating something deeply reusable or are in research.