How to Update my Apple ?

Additional information if required.

Get help with over-the-air iOS updates          

Update – Can’t or can’t restore 

Have you tried using iTunes on a computer or Finder if running Catalina to do the update?

 Update software on iOS devices in iTunes on Mac

If you see an error when you update or restore your iPhone, iPad, or iPod      

Like this:

Update your iPhone, iPad, or iPod touch - Apple Support

The newest update currently available for your iPhone is 13.7

About iOS 13 Updates - Apple Support

Good luck!