According to the situation what you have said, you want to promote your app to make money by collaborating with a reliable agencies. There are many ways of promoting app, today I will focus on the way of app store optimization.
App store optimization (ASO) is a process of optimizing your app to make it more visible and discoverable in app stores so that users are more likely to choose it from millions of other apps.
why is the ASO important?
In fact, searching in app store is the main traffic sources, 73% app installs is from searching app in app store. With the other channels of installing app become increasingly weak, app store optimization plays an important part.
the ways of ASO:
design a beautiful icon
A beautiful icon will leave deep impression to the people who see it, which is also useful for attracting people to download and try your app. Besides the icon, comfortable app screenshots and awesome app video also has a very important effect on the app ranking in the app store.
Create a quality title
According to the Google Play Store data, it shows that the title contains keywords can improve 10.3% ranking in the app store, so be sure to put the main keywords in the title.
get good reviews and ratings
most audiences prefer to choose an app that have the 4/5 stars ratings and more positive reviews. You can guild and incentivize users to leave good feedback. Of course, if you have enough budget, you can collaborate with a reliable app ratings and reviews provider to help you.
do keywords research
keywords serve as the decisive part of app store optimization. With the limit of characters, finding the appropriate keywords of your app is very important. In this part, you can analyze the keywords of your competitors, creating the relevant, competitive and localized keywords to improve the search ranking of keywords.
I hope these methods will help you. If you need help about app store optimization service(buy keywords search installs/buy good ratings and positive reviews), feel free to contact me.