why my face id won’t work?

If you're sure that nothing (cover, screen protector, dirt) interferes with your front camera, see this support article:--> If Face ID isn't working on your iPhone or iPad Pro and/or this one:--> If an alert says Face ID has been disabled on your iPhone or iPad Pro

If, after performing all the steps provided in the above support articles, the issue persists, contact Apple Support directly, using this specific link:--> Apple Support , or make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple - Find Locations - Location Selector. After checking it out, they'll give you all the available options.

Regards

Giulio

kiano ~ Does your iPhone XR still have its original battery?

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

Settings > Battery > Battery Health & Charging

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Hello ~ If working back through the steps in the article you came from doesn’t help you may need to have your iPhone checked…

Genius Bar Reservation and Apple Support Options

Also you may go to lower left and click on Support.

~Katana-San~