Cannot connect to the App Store, iTunes store or any other apps.

Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch    *

Try a forced restart. See the section towards the end of the article.

Reset Device. -

If necessary

Hard reset.     -

Do a backup and try a factory reset. Then restore from the backup.

Restore to Factory setting.      *

Restore - If you see an error when you update or restore your iPhone, iPad, or iPod.   *

Backup - Restore your device from an iCloud or iTunes backup.     *

Hey there,

check this article also ☞ If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support

You need to have good Service & Wi-Fi.

If they are On, turn Off Hotspot & VPN.

See -> If you can't connect or sign in to iCloud

If you can't connect or sign in to iCloud - Apple Support

I can’t connect with AppStore