If your iPad is frozen to the point that you can't reboot it the normal way, perform a forced restart. Charge the battery.

Recovery Mode: Connect iPad to a computer > open Finder (Catalina or later) or iTunes > restart > Update from the recovery screen. If you don't have access to a computer, use iCloud to wipe the iPad ...

Is your iPad not responding, not powering on, or just generally being a nuisance? Sometimes a hard reset is necessary, and it ...