My phone fell in water and my Face ID doesn’t work what can I do to fix this

You have water damage that can't be fixed, time for a new phone.

Make an appointment at the Genius Bar to have it diagnosed.

Genius Bar Reservation and Apple Support Options - Apple

folajinmi Said:

"My phone fell in water and my Face ID doesn’t work what can I do to fix this: after it feel in the water I took it out and dried it off but it says my Face ID is disabled.I tried powering off and on but it has no effect at all"

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Extracting Water from an iPhone:

Contact your local retailer, asking if they have devices that are made to extracts water from mobile devices. Many retailers do.