Hey there,
I would devide the app ranking into two types:
• App ranking which depended on traffic volume and after is reached top position in Top charts
• App ranking according to keywords. This means whether your app will be shown in search result when users will request certain app according their demands.
The top charts ranking can be reached by App Android installs.Keenmobi propose the app installs at beneficial price with different packages. Ordering the installs from Keenmobi is the deal of a day and you reach your target audience.
To get ranking of keywords means launching campaign of keyword installs.
Also to improve your keyword ranking will help review service which propose placing the keywords on app page.
But first of all – you need to ASO service as it is important for general result of your App success. Optimization should be conducted in visual and keyword direction. In case you need order this service – one of agencies is Keenmobi.