I want to recover my Face ID

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)

Emmyrichiie902 Said:

"How can I recover my Face ID"

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Restore from a Backup:

Did you ever back up your iPhone in the current iOS? If so, restore your iPhone from the backup. See if it then returns.