Rolling-back to an earlier version of iOS/iPadOS is not possible. Consider that iOS/iPadOS updates include both functional and essential security updates - the most recent fixing a significant vulnerability. Restoring an earlier version of the OS would undermine the security of your device and your personal data.
All System Updates are digitally signed by Apple - and can only be installed whilst the digital signatures remain valid. After release of a new iOS/iPadOS version, the immediately preceding version continues to be digitally signed by Apple - however, usually within a few days, Apple will revoke the digital certificate with which the earlier version is signed.
If Apps no longer work properly following update to a more recent version of the OS, you’ll need to seek assistance from the related App Developer - as only they can resolve issues with their App.
How to contact an app developer - Apple Support