If you want to increse download of your app in Google play store then App store optimization is the best process to increase download. It help your app to rank higher upon user search queries which increase app download from app store.
My advice on this is create a content review of your app and focus only on the details that really matter. Then tap into social media and reach out to prospects who are likely to be interested with your app by posting this content and sharing it to these people... I think this is the best way to get your app promoted and starting earning from it...
You can promote it with App Store Optimization. It is like SEO but in google play store. I just heard about it. You can check it out. If you know how SEO works then you can have an idea of how ASO works. Some also called it App store SEO.
Social media, viral videos of your app, user videos and reviews, creating a website. You should have all these down and done by first week of launch.
It also helps if you can convince a lot of local people to try the app and review it so it gets momentum, I went door to door to show my app to people before it became somewhat known.
You need to understand some marketing concepts and apply them to your target audience. And it wouldn't hurt to advertise heavily on blogs/sites with a lot of traffic.
For me, the easiest way is to ask your family and friends to be the first person to use and spread the app. If you have employees or co-workers ask them to use your app. Then let it go with flow, let them give you details or suggestions to improve your app. You may use as well your blog or vlog to promote you app. Make sure to maximize everything you have first until you're capable of buying your own advertisement.
You can promote your Android apps by social media there are so many platforms to choose from like Google play, Facebook, Twitter, and many others. There are also ways that could cost you a lot of money like advertisements in banners, commercials on Youtube and creating web page online. If youâ€™re really willing to increase downloading your apps be ready to invest so thereâ€™s a risk because it involves money. But who knows you might generate good profit from it. Just make sure youâ€™re android apps are worthy so they recommend it from their friends and relatives.