How can I fix my iPhone Face ID?

Try the instructions in the following guides to address the Face ID issues that you are having. It would have been nice if you had posted the issues in details.

👉 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 or iPad Pro - Apple Support

If the guides, above, do not help resolve the Face ID issues, then contact 👉 Official Apple Support OR you can always get your iPhone examined at the Apple Store 👉 Genius Bar Reservation and Apple Support Options or at an Authorized Service Center for further diagnosis and a resolution.

Axel F.

Please follow the directions in the link above your post.