ASO is important but Google play only lists the top 250 results.
Promote your app on Reddit.
Promote your app on forums like AndroidCentral, XDA developers forum, etc.
Answer the relevant questions to the app you made on Quora.
Join groups on Facebook share your app there.
Promote app on Twitter, Pinterest, Google+ community.
create a very nice app promotion video and send it to each and every channel.
Doing all these will surely increase your downloads and your app will be featured in the top list of google play searches. This is what all other people are doing but you need to give continuous efforts for some months.
So Start doing this and let me know if you need any help.
Many of them have shared stories of investing large amounts of time and money to make their app and also tell me how to promote an app.
I am sharing here those creative ways to promote your app:
1. Get in Touch
2. Reach Out To Influencers
3. Leverage Your Mobile Website
4. Feature the App in an Official Blog
5. Feature The App in Your Emails
6. Create a Demo Video
7. Offer free trials
8. Apply for Awards
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