Cliche but true: Become your client and swim in their circle.

I sold a product for business users. I presented myself as an expert in the field and became active in the field. Although the product actually came after the fact as I figured I might as well monetise on my publicity.

My first paying client contacted me days after I posted an open for beta landing page without any marketing.

Edit: after the first few customers, I failed to keep momentum and my business flopped. I folded it a year after.