What kind of app is it? It is hard to say what you might have to improve on if we do not know what you made. You obviously need more installs per day, but why you’re not getting that many can be because of multiple reasons. A bad icon (experienced this myself a week ago) for example can really discourage people from installing your app.
The first thing I already notice is that you do not have any translations whatsoever. I think this is arabic? It is quite hard to understand what your app is about if you are from a different country. You want to widen your market and have translations available for any of the available languages. A simple copy paste from google translate really helps a lot! If you do this you will probably see your amount of installs boost up already.
A simple copy-paste from google translate is not correct all the times. it gives completly opposite meaning sometime when you convert it back to original language.
It is very tedious and time taking for few specific words to convert.