iPhone 10 has black screen and frozen won’t do anything
My iPhone 10 is completely frozen on the black screen and won’t reset using steps recommended online
iPhone X, iOS 15
Are you referring to the steps in this support article? If your iPhone won't turn on or is frozen - Apple Support
If so, and they didn't help, the last step is to contact Apple Support. You can do so simply by selecting the "Get Support" link in the upper right-hand side of this forum's web page.