You have your app (or program or software, won't debate what to call it) and to make ends meet you need the "$43,000 for the software and pay licenses of about $500 per month to our vendor who we have to pay, "

So at 500 a month and they are currently paying 300 a month you see the problem.

My advice is to either "Cut out the middleman" of the 500 a month by a rewrite to drop your need for licenses or PIVOT and find a new program/app and get your software company going in a new direction.