My iPhone 11 fall inside water and the TrueDepth camera is not working and my Face ID is deactivated

If you live near an Apple Store, make a Genius Bar appointment to have the device/computer tested. Supposedly there is no charge for testing. Use 3rd link if not near an Apple Store or aren’t in the US. Take the original purchase receipt with you.

Genius Bar Reservation  -  US.    

Find a store.  -

Authorized Service Provider.  -

Sounds like your iPhone suffered water damage. It will need to be replaced if you want to have a full functioning device again.