It would help if in the mailchimp node under the member option there was an option to archive a contact.
In Mailchimp, archiving is like a soft delete. My use case requires archiving the contact and at some point in the future I may need to re-register this contact, with the delete method this is not possible.
Archiving a contact is very similar to deleting, just change the HTTP verb from POST to DELETE and remove the end of the link:
Delete list member (already exists in n8n)
POST /lists/{list_id}/members/{subscriber_hash}/actions/delete-permanent
Archive list member
DELETE /lists/{list_id}/members/{subscriber_hash}
Mailchimp docs: https://mailchimp.com/developer/marketing/api/list-members/delete-list-member/