Similar to Search Engine Optimization (SEO) there are many ways to optimize mobile App for ranking higher in Google Play Store. You can also make your content rank higher in search engines. Moreover App Store Optimization is the quality process of improving the visibility of the mobile apps in play store searches. The capital idea behind ASO is to accurately optimize your Android app to make appear on top.
You can also drive global users to your app page and increase downloads. If your app is illustrated on top of other similar apps, there are good chances of a global user downloading your app over the other app is immensely high.
It is known fact that no one knows accurate algorithms used by Google Play store for ranking the apps, but acumen experts illustrate that there are few ranking factors which would play the key role in ranking of your app in Play store.
The number of downloads of your app reflects the familiarity of your app. The more downloads your app has more effective chances it has of being in the top search results.
App Reviews and Ratings
The giant Google gives more importance to the search optimization. Apps having effective positive reviews and best ratings are given much higher preference to the apps having lower ratings by global users. So less familiar apps with lesser downloads but better ratings are actually ranked higher than familiar apps with a lower rating.
For how much period of your app is kept installed by the global user in their mobile is certainly a factor which Google virtually consider. The popular Google seems to actively track the time of app installation and offer positive points for longer installed apps.
The app developers with instant un-installation of the apps after being downloaded when the latest version is released would definitely get your app bad ranking in search results. So you can try to avoid this happening for better results.