Read this Guide - http://www.appsgeyser.com/blog/become-popular-app-stores/
Here are some quick tips how to become popular on Google Play Store:
1. Create a good looking icon
The icon is the first center of attention for any mobile app. It's important to have a good visual appearence of the app to make a good impression on users. Your icon should be different from competitor apps.
2. Make high quality screenshots
Most users decide to install an app just by judging screenshots and wether they like the app design or not. To get installs you need to make sure that your app screenshots are top quality that shows the best parts of your app and features.
3. Find strong keywords
The keywords can define up to 80% of app success. The strong keywords will help you to get on top of searches on Google Play. Don’t use a one-word or irrelevant keyword with a high level of competition. Be specific! Use keywords both in the app name and description.
4. Write a description
The description is not only the field where you can insert imporant keywords, but also text that can bring more attention from user. List the app features, unique benefits and value, add call to action to get more installs.
5. Use branded keywords in name and description
Using popular names of video-games, apps, websites can boost app installs. But you should be careful about it. You can easily get banned for copyright infringement. Don’t name an app with a brand title only like “WhatsApp”, “Telegram”, or “Facebook” and etc. Add these keyword to the context - "Stickers for WhatsApp", "Guide for Telegram", "Share on Facebook", etc.
6. Translate a text content into multiple languages
Users can search for your app in their native languages and may miss these users, if your app is only in English. Use Google Translate or any translator to add languages for your app description and name. Target the most popular languages in the world.
7. Choose the right app category
Choose the app category less crowded and less popular. You have less chances to make app popular in th Arcade or Action categories, since they are the most over-crowded.