Why aren’t my apps working anymore

I am not having that issue, however, I recommend that you Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

Axel F.

Hello ~ Take a look here and see if this info helps:

If an app on your iPhone or iPad stops - Apple Support

~Katana-San~

No.