So just imaging this scenario: you are the product manager for a wildly  successful mobile application. 

In fact, your application is so  successful that your company got bought by another much larger online  company for a lot of money just a few years ago. That was all well and  good, but the reason that you got bought was because that other company thought that you would eventually be able to make enough money to justify their investment in you. 

As a product manager, how would you go about transforming your free-to-use service into a money making machine?