Please my Face ID is nothing working anymore

This Support article is specific to seeing a 'disabled' Face ID alert, and explains what to do when you see that notice or an issue with the TrueDepth camera. --> If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

Unless a software update solves the problem you may need to have Apple take a look at your device. Use this link to set up an appointment —> Genius Bar Reservation and Apple Support Options - Apple and this one to get a repair estimate —> iPhone Repair & Service - Apple Support

If your Face ID is disabled this is most likely a hardware issue. Please update your iPhone to the latest avaliable software version for your device, and if this is not working, please Contact - Official Apple Support to set up hardware service for your device