I did App Store Optimization (ASO) for a big number of Android apps. Some of those apps had tens of millions of installs. Results of my work were up to 300% more installs on a monthly basis on a specific app or game after the ASO was implemented!
I was implementing the App Store Optimization description in various kind of apps: kids, photo editors, social, utility, different kind of games, etc.
I made hundreds of AB tests on Android apps.
Also, I do detailed keyword research with more tools such as TheTool, AppTweak, Google Keyword Planner, SearchMan...