I've been unable to get my iPad Pro 11" to survive loading each of the iPadOS versions released thus far, so I've learned how to get out of an apparently bricked iPad (if you have a model without a home key). Click the Up Volume botton, then click the Down Volume button, then click and hold the power button for a really long time. On my iPad, first the screen will go black (if it isn't already), then a large apple logo will appear on a black background, then the screen will go black again and eventually the recovery mode graphic and text will appear on the screen. At this point, plug it into your Mac and restore or recover, whichever works for you. For me, only setting up as new iPad worked and took me back to the latest released (not beta) iOS version. Then you can restore from your latest backup.
Sandy