It sounds like you submitted a link to HN or similar and have concluded your lack of success was caused by an issue in your code or a defect in your sales funnel, but that was simply never going to be enough, it was never going to be that easy.

Focus on finding a real source of customers. Easiest free solution is to get websites to write about you and send you their traffic. Fastest and most accessible solution is to buy ads. Lots of slow-burning options like increasing your visibility through blogging, writing articles and open source contributions.

Happens, sorry for you. I am not good at marketing, and maybe analyzing the market and finding a relevant product to build. So I know the feeling. I'd just use it as a portfolio project to talk about it again once I get a chance: on a job interview, when socializing in professional circles, write articles, etc.