The app is featured in the Best New App section in some European countries, but has poor visiblity in USA where I think it could have the best market.
Use a combination of mobile network ads, Facebook ads and keyword changes in your app to help discovery . You want to give your app a push up the higher rankings and let iTunes take care of the rest, once you are up there.
If you get up there and downloads drop when you stop advertising, something needs to change in your app to make it sticky.
Let's hop on a call for more in depth action steps.