[jasfi]

It seems that there is a product/market fit problem that the author keeps hitting. Or simply, building something that the people who would find it useful actually want.

I have had the same problem. One way of overcoming this is to have a co-founder that has experience in a particular market, and knows the problems that need solving and the people who are affected by the problem. Another way is to do more thorough market research.

It seems to be a common problem for technical (only) founders.