Join groups on social media, and share your link. Make sure your caption would catch the peoples attention so that theyll be intereated on your ad or link. Maybe the way you promote is not convincing?
The power of social media is no doubt the most powerful thing in the entire world right now as there are number of people who are using social media and that too on daily basis. Other than this, you can also put an advertisement on television or you can also post a banner somewhere in the city but this will not grasp as much audience as you can get by putting an advertisement on social forums.