My AppStore not responding showing * cannot connect to App Store * please help to fix it

Try to optimize the range of the mobile network, see this Apple article:

If you see No Service or Searching on your iPhone or iPad

If you see No Service or Searching on your iPhone or iPad - Apple Support

 See this Apple article: If you can't connect to the App Store, iTunes Store, or other Apple services

If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support

• If you tried all of the above steps and you still can’t connect, contact Apple Support.