that's true - our space is inherently non viral. we have so far gotten users organically through play store and google search. we are experimenting with paid marketing channels for growth.
There are communities on the internet that are specifically for these issues. Light advertisement with the consent of various moderators would not be bad idea. /r/NoFap comes to mind specifically, but also various religious communities where the desire for NoFap extends more from religious obligations would still find this interesting, I imagine.