Comment by know-how

"how do you attract customers?"

You're in a tight spot because you're asking this question after the product was built.

#Who is my customer, where can they be found, how do I reach them, what do they buy now, who do they buy from already, how much does it cost to get in front of them, what modalities do they respond to, how do competitors price, position, and reach them? What is the actual problem, what are the core benefits they seek, what solutions exist today and what do they lack or ignore?

These are questions that need to be answered prior to building anything.

You will have an incredibly difficult time selling what you have now if this research was not performed beforehand. Do this the research and then decide if you can save it. Otherwise, you've learned a valuable lesson and should start anew. Many great projects were built upon the bones of past mistakes.