Index your app
As mentioned within the course, indexing your app is not for free. If you had the chance to develop your app with App Inventor 2, note that you can index your app within the App Inventor 2 gallery for free, available at http://ai2.appinventor.mit.edu/.
If you have some money to spend, this exercise consists in spending 25$ in order to create an app on the Google Play Store. Once you do so, handle a one page pdf where you will justify the choices you make in order to make your app more visible on the Play Store.