1. Take time off, like a month or more. [1] Use it to do anything other than coding. Hone a hobby, travel, volunteer, etc. No-one will care about a month or two gap on your resume. 2. You are worth more than you currently think you are. Internalize this, know this, that is key. "I am a sole developer for Mobile and Web platforms at this startup in a very small team" --> is a desirable skill in and of itself. 3. Stop…
But what if they aren't worth more (as a dev, financially) than they think they are? They could be awful, but naively put in a ton of hours. Why do we assume people are worth more? Are we trying to make them feel better by making assumptions and potentially leading them horribly astray? Most people are supremely mediocre and there are just and many horrible devs as their are great ones.
I will say horrible devs are far more than great ones. In my 15 years of experience I have seen far more mediocre or downright horrible than great ones.