I ran into a similar problem with my online course. I even went the extra mile and market-tested the idea. I thought for sure, people would pay $30 for a one-hour mini course on how to improve your Zoom shot. It's been live for two months now on three different platforms and nothing. I would probably make more money with either live consultations or going into their homes/offices to do the work myself. Or devote a ton of time "building my brand" so people trust the advice enough to pay for it. Not exactly the "passive income" promised by creating an online course