"If your side hustle [insert: product/service/advice] doesn’t solve a problem then it’s worth $0."

Tim, this one sentence is perhaps the most honest and undeniable "truth" that I've read on the subject of side hustles in the last five years. IMHO, it is infinitely more difficult to build a business on the basis of mere desirability. In the absence of "pain" - a/k/a a problem of some kind -- there is just not sufficient reason to pay.