The process of promoting apps to the top is quite different from promoting websites or social networks. But it's not as confusing as it may seem. But it does take a lot of time. It is better to turn to professional ASO services
https://seotwix.com/app-store-optimization, where your app will be promoted in app store listings from scratch and your app will become much more popular. This company has dozens of positive reviews because it has a lot of experience in this field.