We should invest some time to polish the google playstore presence. Most of these points come directly from the google play console:

• new screenshots after UI overhaul
• show different designs for smartphones and tablets and get Bitmask into the Designed for tablets list in the Play Store
• Add localized graphics for German and Spanish (Spain) You have already translated your store listing or APK into German and Spanish (Spain). Localized graphics could help these users better understand what your app does
• Translate Product descriptions into German and Persian Your app is popular with users who speak German or Persian, but this app's store listing isn't translated yet.
• Translate the app into Persian
• figure out how Google AdWords works and evaluate if it is reasonable to use that tool