Hi there, based on my experience, to increase your app downloads, you should make your app title, icon, screenshots, description and video attractive, which can increase the download rate effectively. List new features and outstanding features into first 3 lines description(most people just browsing first 3 lines).
The next thing is getting positive app reviews and 4/5-star ratings. At the first beginning, your app has seldom users, needless to say the reviews and ratings. But data shows that about 95% users will take the app reviews as one of the most important reference factors to judge the app and 95% users prefer to download an app which has much more higher ratings. So it’s a good choice to buy app reviews and ratingsat the first stage. What’s more, these apps which have much more positive reviews and higher ratings rank much high than others.
Then you should market your app efficiently to get more traffics. Here are some effective marketing methods for you:
Apply for Awards
Participating in app awards is the most recommended channel and I would highly suggest you take advantage of it. It can give you tons of press, exposure, reviews and plenty of downloads.These are many famous app awards sites, such as Appy Awards, Best App Ever Awards, AppCircus competition, Apple Design Awards, etc.
Paid Influencer
Most people like to follow others and be influenced by the words of some celebrities or well-known business people. When you reaching out influencers should be careful to only present content that is truly relevant for the influencers and their audience. These people may include influential bloggers, newspaper journalists, professional tech writers in social network like Facebook or Twitter.
Being featured
being featured by Apple or Google (or PR/Influencers) is high volume and provides good ROI, but relatively few apps are chosen for store features, and again, the vast majority of buzz (whether store-sourced or otherwise) will result in a temporary burst of downloads, rather than sustained visibility.
Hope those methods are useful to you.