Frankly, you're probably better off learning some SEO, writing some articles in your niche, and waiting for a while (6-12 months) for your website to show up in

Frankly, you're probably better off learning some SEO, writing some articles in your niche, and waiting for a while (6-12 months) for your website to show up in Google results for as many keywords as you can. Use a tool like Ahrefs (you can get 7 days free iirc, or just use it for a month and then cancel) to find keywords people search for in your niche and start writing. When you're selling stuff on the internet, keyword data is illuminating! Use keyword data to think about why people want a Geiger counter (I see you have a survey!) and the kinds of problems they have, then show them how yours fixes their problem.