I think it might be too early to talk about failure, I think 4 months from start to finish is a very short period of time for building and launching to deciding that no one wants your product.

Your product has been exposed to a tiny tiny tiny percentage of those who it could be. 1 customer out of 1,000 potential is a very low conversion but who's to say you're getting the right type of traffic?

Take a few days to speak to small business owners (in person maybe, or on the phone) and maybe consider a change of tack to a smaller niche that have a specific problem.

Maybe convert to a Shopify plugin? We pay for 3 for our business and they are both very feature light but they solve a specific need.

Also, look at companies who sell online but make product to order. Tracking raw materials against a final product sell is a real nightmare and not one that any of the big shopping cart players manage (3 years ago they didn't at least).