You can discover which important intrinsic values people are willing to re-apportion to extrinsic value through currency exchange. Is there a thing you can sell that you can (through the magic of marketing) associate with, say, falling in love? Raising children? Satisfying thirst or hunger? Raising class status? Pick any important driver of human behavior and hitch your money-making scheme to it. Or if creating a business sounds too risky, look into the US Labor Dept’s crystal ball for occupations and median pay: https://www.bls.gov/ooh.