I have a friend who has a car garage. He needed an easy way to document activity and to print this to his customers. All applications available were hard to wor

I have a friend who has a car garage. He needed an easy way to document activity and to print this to his customers. All applications available were hard to work with(old, windows installers, expensive). I made him a web application: https://www.la-moldo.ro https://www.la-moldo.ro. After 3 years with no advertising other than a facebook page, app has almost 1000 users and users calling to thank me for this. Some even ask to pay but i have no monetization strategy.