After reading the question, my understanding is that there have been fifty leads, five prospects and zero sales. I might be misunderstanding.

Looking at the numbers for this pipeline, increasing leads will not increase sales. A higher rate of conversion from lead to prospect will not result in higher sales either.

My advice based on my understanding is to close sales and have actual customers -- have people paying money. Closing sales is key to receiving feedback about what people will actually pay for and help establish a good pricing model for customers. It will help qualify leads into prospects and help narrow the market segment from which leads should be drawn.

Good luck.