How to reduce the size of a React Native iOS application?

I have created a React Native application for iOS and Android. It is using some custom fonts. Please check the size of the folders :

1. Font folder - 18mb

2. Assets folder - 1mb

3. coding files - 118kb

This is in my package.json file.

But my complete app is showing on the app store is around 65.5mb and after download it's size is showing around 77.5 MB.

Can anyone suggest me what should I do to reduce my iOS application size? These libraries are necessary for different functionalities of my application. Please help me to reduce the size of the app. There are multiple tutorials available to reduce android application size but how can I reduce my iOS application size.

Also, I have tried to minimize the size of the .otf file but not find any tool or website that works for a mobile app.

Thank you.