Voice memo.
How to recover voice memo when not in deleted folder anymore
iPhone 11, iOS 15
Question marked as
Hello,
If it is in a past iOS backup then you may be able to find it but you would have to restore your entire device meaning that everything would reset to when the backup was made. For help restoring a iOS backup follow the link below
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
Hope this helps!