There are many factors afect the app ranking, you can boost your app rankings through the methods.
Get positive Reviews & Ratings
Apps with higher star ratings and more reviews typically rank better in the app store. One of the best ways to increase the number of reviews for your app is to ask for reviews inside the app. A certain amount of positive reviews also help to attract more users to download your app. Good reviews will notify those potential users that your app is high recommended and good reviewed by other users, which will help to generate more installations.
App Store optimization
App Store Optimization (ASO) is the SEO of the App world, and a key part of mobile app marketing. The more you can do to optimize your App store listing page, the better your App will rank in the App stores – making it easier for potential users to discover you. You can do it from the following aspects:
Optimizing app title
Optimizing app keywords
Optimizing app description
Optimizing app screenshots
Understand The App Stores
Both the App Store and Google play have some differences that are important to understand, however they are constantly changing, so it’s important to pay attention to their trends. While both serve the same ultimate purpose, each put a stronger emphasis on different elements that are vital to fully understand in order for your app store optimization efforts to work correctly.
Downloads rate
If an app store sees that almost every person that comes to your app’ s page is downloading your app, chances are you’re going to go up in the rankings. You can increase the download rate by creating a quality title, attractive icon, screenshots and description.
Engagement and Retention
User retention will affect the app ranking, the App Store values users’ engagement and feelings. To do this, you will have to find out what your users think about your app and what they love. You can discuss with your app fans to listen to their voice to make an app they love.
Regularly Update and Upgrade
Keep a regular update for your app, one side, it sends a signal to the app store and let them know you are keeping spending time and energy in improving your app experience. This is very helpful to maintain and boost your app ranking.
I hope this has been helpful.