How to Rank an App for any Targeted Keyword from Scratch?

If your app is NOT ranking at all for any targeted keyword but you still want to promote it then, first of all, you will have to try following tricks so as to push your app into the search results of the targeted keyword:-

• Run CPI campaign at https://cpidroid.com/ to get some traction in order to boost visibility and penetration into the Play Store or App Store which will help your app to get indexed better for search.
  [Highly recommend for new apps otherwise your app will just be lost among millions of other apps]  
• Try incorporating your targeted keywords into your App Meta where ever possible such as App Keywords, App Title, App Sub-Title, App Description ...etc.
  Note: make sure you do not do it too aggressively otherwise it will look spam!
• Try adding/writing reviews to your app in PlayStore or AppStore in such a way that the targeted keywords are present in the context of the review.
  Note: do not do it from your dev account instead ask your team members or request your family and friends to do so.
• Try giving "Thumbs Up" or marking "HelpFul" to the reviews in PlayStore or AppStore which contain your targeted keywords.
  Note: do not do it from your dev account instead ask your team members or request your family and friends to do so.
• Try incorporating your targeted keywords into your App's Website where ever possible such as Meta Tags, Blogs, Pages ...etc
  Note: if you do not have any dedicated website for your app then try to develop one.
• Try creating backlinks to your PlayStore or AppStore link by making use of the targeted keywords as anchor text.

Once your app enters into the search results of the targeted keywords and stabilizes at the desired rank position then quickly start running keyword campaigns for the targeted keywords and keep doing it on a regular basis if you want to keep your ranking otherwise it may drop with time.