I went remote a year ago and have had the constraint fear of losing my job, even though I know for a fact that there are other devs who do less work than me and slump around more than me. Never want to go back to office life again though.

I lived in constant fear the first few years at my current job. I think this is kind of normal. Monthly check-ins with my boss really helped.

Try to focus on the areas in which your 'tribal knowledge' is difficult to replace, or how difficult it would be to find someone as good of a fit as you are. They're keeping you around for a reason, so relax a little and let yourself focus on your work instead of your job security.

If you really do feel concerned, ask your boss about how you can be a better employee.