For much newer design iPad models, without a Home button, try the new simple hard reset procedure for the new 2018/2020/2021 iPad Pros, 2020 iPad Air 4 and 2021 iPad Mini 6 models.
1. Press and release the volume button closest to the top Power button
2. Then immediately press and release the volume button farthest from the top Power button.
3. Then, press and hold the top single sleep/wake/power button You will see the Slide to Power off button, but keep on holding down the power button until you see the Apple logo, then let it go.
Once you have performed all the steps, wait for a few seconds and your 2018 iPad Pro will boot up completely to the iPad Pro’s Lock screen.
If this is a fail,
It maybe time to use the “Get Support” link, at the upper right hand corner of every Apple Support Community Webpage to attempt to schedule an appointment with your nearest Apple Store location to have your iPad diagnosed by Apple employees and options presented to you.
Apple Store employees will be glad to help/assist you.
Best of Luck to You!