Cannot connect to App Store or any of my Apps.

Also note that being connected to Wifi is not the same as having an internet access. You can certainly be connected to your Router, which is the WiFi connection and the router is not connected to the internet.

• Restart your router and check connectivity.
• Switch off WiFi on your iPhone to check cellular connectivity.
• Do you have a VPN? If so remove it, just turning it off is not likely to help.

Try a forced restart.

• Press and quickly release the volume up button

• Press and quickly release the volume down button

• Press and hold the side button.

• When the Apple logo appears, release the button.

Force restart iPhone - Apple Support (IN)

See this article.

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

Since you’ve tried everything above, this should be your next step.

iPhone Repair and Service - Apple Support