In my sleep
Complete this sentence:
"I could ____________ in my sleep."
Whether it’s writing code, teaching high schoolers, or composing piano music, chances are, there’s a market for that work you could do in your sleep.
Go find it.
(Of course, this doesn’t mean there isn’t inherent value in challenging yourself, pushing the boundaries, or learning new skills. But chances are you already have at least one field in which you could add significant value to another person. And even if it’s a niche group - at first, or always - consistently adding value to others increases both your happiness and your net worth.)