Notes
All my notes has disappeared. What should I do?
iPhone X, iOS 13
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Have you checked the Notes app and iCloud.com/Notes using a computer browser for a Recently Deleted folder?
If you weren't syncing Notes with iCloud, do you have a backup you can restore from? Restoring from a backup erases all data currently on your device. Any data newer than when the backup was made will be erased. A restore is an all or nothing restore. You can't access a backup and only restore certain files.
Backup - Restore your device from an iCloud or iTunes backup