How to bulk change Contacts
This was released yesterday and I already used it to clear notes from thousands of contacts.
AddressBook Aid2
https://apps.apple.com/ca/app/addressbook-aid2/id1289067335?mt=12
I also purchased this to so a nice job on cleaning up contacts based on email and phone numbers.
Cisdem ContactsMate
https://apps.apple.com/ca/app/contactsmate/id1236603338?mt=12