What can I do with that trouble “ Face ID has been disabled”

Your iPhone has detected that there is an issue with the sensors used for Face ID. Make sure that your iPhone is running the latest version of iOS, and if the issue persists, contact Apple Support to set up a repair.

If you don't know how to update your iPhone, you can use this article to help. Go to Settings > General > Software Update to check for updates. The latest software version is iOS 14.7.1. Update your iPhone, iPad, or iPod touch - Apple Support

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

From this screenshot, your iPhone is still in warranty. Issues related to the TrueDepth sensors used for Face ID may be related to user-caused damage, but if it isn't, you could be eligible for a free repair. Because your iPhone is up-to-date, you should contact Apple Support to set up a repair.