Phone won’t shut off and apps don’t reapind

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)

Did you try the forced restart in the instructions in the article you came here from? Please keep in mind as you do the steps do them quickly.