Boot loop on my iPad

Try the suggestions in this article:

If your iOS device restarts or displays the Apple logo or a spinning gear unexpectedly - https://support.apple.com/HT203899

What year and model iPad do you have/own?

The “A” model number can be found on aluminium back of your iPad in small print right under the larger bold print “iPad”.

What iOS/iPadOS version is this iPad, currently, running?