Build me an app

I want to develop a mobile app for children age between 3 to 14, in android and ios. Have you done before any educational exercise? My app is an interactive base that children can increase their reading speed via story or articles and learn new words, can play educational exercises and win coin and rewards. It is a lifetime updating application. We need to update day by day. specific points - login - upload photo - kids animated photo - send OTP - videos - background designs( overall application) - 2D animations - gif ppt - stories and articles - tests - add new words - logo design - show icons of the home page, records, coins, scores, parents guidance, settings, etc.. - voice of content - sound content -microphone - timer - growth report chart - notification - upgrade premium for monthly, 3 months, 6 months, 1 year - referral code - add many languages - fix exercises according to reports - an in-app purchase - tracking records of children - how many time logged in - sharing with friends Here I have mentioned almost the main points that I want to apply in the application, my budget is $ 500 of the complete project. Kindly looking in this matter and revert me back as soon as possible.

I am an experienced android developer. But during these days I started freelancing I can assure you that I can complete your work.