If the touch screen is unresponsive, you’ll not be able to directly access the iPad. Your only remaining options are:
a) attempt a Factory Restore in the hope that the problem may be resolved.
b) if (a) isn’t possible, attempt a DFU Restore with the same aim.
c) seek assistance directly from Apple.
Factory Restore:
https://support.apple.com/en-gb/HT201252
DFU Restore:
https://osxdaily.com/2010/12/04/ipad-dfu-mode/
Apple Support can be contacted using the Contact Support link at top-right of this page.
I hope this information is helpful in recovering the iPad - or directs you to alternative source of support. Please do let us know how you get on.