I'm not surprised that this project doesn't bring you money, you didn't put enough effort into making it a reliable service and gaining a user base. For success, it is still not enough to just create a website with an application, much more engagement is needed.
btw. I do not believe that it is possible to get quality help for free, certainly not in the long term.

I know that you have already spent a certain amount on everything about pnnv.com, it would be a shame to abandon the whole thing, but if you don't have the time/possibility to further develop and maintain it, it might be better to stop the loss and move on.