My iPad Pro screen turned off suddenly!!

Try unplugging it and plugging it back in.

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

If the steps in the support document yield no results, you may need to take it in for diagnostics. Something possibly failed.

Set up a Genius Bar Appointment: link-> iPad Repair - Official Apple Support

Start a service request

Plug the iPad in to power to charge.

Try quick press Volume up, then quick volume down and then hold down power button. Then it should restart.