I tried restarting it but it still isn’t working
Why is the right side of my device not work
iPhone 11 Pro Max, iOS 15
Question marked as
Try turning it to landscape. If the top of the screen is now not working then it is not software and no amount of restarting will help.
See also Some of my iPhone or iPad keys or screen … - Apple Community
As a last resort try a Forced restart Force restart iPhone – Apple Support (UK)
If no better you should arrange a repair iPhone Service & Repair - Apple Support
Or
Contact - Official Apple Support
Anything other than Screen or Battery may be a replacement phone and the price is in the article under "Other damage"
See also: Get your iPhone, iPad, or iPod touch ready for service - Apple Support