There are many various ways to promote an app. Based on a few articles, I picked the most interesting, efficient and useful ones.
https://www.forbes.com/sites/allbusiness/2015/11/07/65-simple-ways-to-promote-your-mobile-app/#38205e0748c4
- Make a simple, clear introduction to your app.
- Start a blog with regular updates.
- Use social media in an interesting and intriguing way. Interact with the audience.
- Create teasers.
- Ask for the reviews.
- Contact writers in the niche.
- Share interesting infographics.
- Apply for App awards.
- Clearly define the problem that your app solves.
- Start a community.
- Work on the App Store content (description, screenshots, trailer…).
- Host a contest and announce the winner publicly.
- Create a video channel (YouTube, Vimeo).
- Hire a PR firm.
- Pay for advertising on relevant websites.
- Grow a subscriber list.
- Respond positively to negative comments.
- Monitor your performance. Keep checking your analytics via AppAnnie or Flurry.
- Run an Ad campaign on Facebook.
- Design wallpapers and posters that your users will love.
- Post creative content on Pinterest.