If you've already tried (to no avail) to perform correctly a "forced" restart of your iPad, using these instructions:
- On an iPad with a Home button: Press and hold the top (power) button and the Home button at the same time. When the Apple logo appears, release both buttons.
- On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top (power) button. Only when the Apple logo appears (it might take 20-40 seconds), release that button (ignore all other screens that might appear).
see this support article:--> If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
If you don't have a computer, borrow one from your friends, or ask for help at an Apple Store or Authorized Service Provider.
Regards
Giulio