Developing an application to edit files for iOS

I have a Files app running on iOS (the app is up and running)
The application is uploaded to the Appstore and I want to update and develop it
The services that I would like to provide in the application are:
1- Translate the pdf file
2- Convert pdf file to mp3 audio file
3- Convert the file format from pdf to word and vice versa
4- Compress pdf file size

I have
XD design
The source code is in Swift