Why my face ID is not working

If you truly tried “everything” (but Everything to you may be different than Everything to me), including →If Face ID is disabled on your iPhone or iPad Pro - Apple Support then your phone is broken and you should contact Apple support to discuss repair options. There’s a link in the above support article that goes to the right support department.

Have a look at these two articles -

If an alert says Face ID has been disabled on your iPhone or iPad Pro

If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

If Face ID isn't working on your iPhone.

If Face ID isn't working on your iPhone or iPad Pro - Apple Support (AZ)