iPad touch screen

Did you reboot your iPad?

Follow this procedure if you haven't:

If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

• iPad models with Face ID: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Press and hold the Top button until the device restarts.
• iPad with Home button, iPhone 6s or earlier, and iPod touch (6th generation) or earlier: Press and hold both the Side (or Top) button and the Home button for at least 10 seconds, until you see the Apple logo.

Then it's time to schedule an appointment at your Apple Store Genius Bar for evaluation.

Do you use a screen protector?

I had this same problem too a couple of years ago. The screen was unresponsive, until I removed the screen protector. I'm not sure why it helped, but it worked.