How to open my iPhone with my Face ID?

Perhaps some factual clues on how to attempt to restore this function are covered here:

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

//support.apple.com/en-us/HT208186

If these do not help, contact Apple support directly as article indicates.

Good luck & happy trails!🏕🎣🐾🤖🍄🌼

Bobby-tee ~ Does your iPhone X still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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sani247 wrote: "Please I need my Face ID back"

sani ~ What model of iPhone is it?...

Settings > General > About > Model Name

And what version of iOS is it running?...

Settings > General > About > iOS Version

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Please I need my Face ID back