I can’t restart my phone or force shutdown

Hello, Dianabeal.

FIrst, go to Settings > General > Shut Down.

If that doesn't work, try to force a restart with the buttons as describe in this suport doc –

Fore restart iPhone - Apple SUpport:

https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios

• Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the side button. When the Apple logo appears, release the button.