You don't have customers. Customers buy things. However, you seem to have at least the appearance of something some people want. That's a good start. Why are they signing up? What are they signing up for?

A survey, or actually speaking with them, about what is blocking them from moving forward would give you some answers. Perhaps what you offer is not exactly as described. Perhaps the users do not have the money (wrong target market) to afford your services. Perhaps your copy is not compelling enough.

If you are getting signups, then you must be appealing to some kind of 'pain' these people are experiencing. But there is a hurdle to be overcome for them to invest money in a solution to get rid of that pain, and your site is not yet doing that.