I want to build an app like Storytel for Mobile and Web

I want an Storytel like an app which consists:

Register and create a profile
An audiobook store with a user library management system built-in
A web platform from which users can access their audiobook library
Download audiobook and podcasts for offline usage
Customize the look and design of the app
Ebook functionality
Customize volume and other aspects of sound with an equalizer
Search and filter through various choices of audiobooks
Contact customer support
Give Reviews and Ratings
Social integration for sharing audiobooks with friends
Support for downloadable audiobook formats
Support for connecting audiobook app to smart speakers

User Panel Features:

Sign up/sign in
Play/pause the audiobook
Background play audio podcasts
Save audiobook for listening later

Admin Panel Features:

Manage subscriptions
Add/delete audiobooks
Manage advertisements
Manage the extra content