iPad Pro stuck on the apple logo

If iPad isn’t responding, before proceeding to other actions, do one of the following:

• On an iPad with a Home button: Press and hold the top 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 button. When the Apple logo appears, release the button.

Note: If iPad still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPhone, iPad, or iPod touch won’t turn on or is frozen.

If you continue to experience difficulties, the final section of the linked support page directs you to Apple Support.

Have you looked at the section "If your device turns on but gets stuck during start up" in the following article: If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support