Two possible suggestions…
1) Backup your iPad using iCloud or iTunes - and then Restore your iPad to Factory Settings. This will both wipe the iPad and fully reinstall a fresh copy of iPadOS. After Restoring to Factory Settings, you can restore your data from your backup.
How to back up your iPhone, iPad, and iPod touch - Apple Support
Restore your iPhone, iPad, or iPod to factory settings - Apple Support
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
2) Seek assistance and advice directly from Apple Support. You will find the Get Support link at top-right of this page. Alternatively, you can open a support case using the excellent Apple Support App (recommended); of not already installed on your iPad, the App can be downloaded from the App Store:
https://apps.apple.com/gb/app/apple-support/id1130498044
A further alternative is to seek help from the technicians at the Genius Bar of your local Apple Store:
Genius Bar Reservation and Apple Support Options - Apple