Do you want an infinite loop, going on forever until someone unsubscribes?
While this would be technically possible, I question the reasonableness of this project.
Why should someone react to your offer from week 1 to week 6 if he didn’t before? The reason can only be circumstance, for the recipient not reading your mail. But the higher chance is, he didn’t like the offer in the first place.
The most important reason someone did not react to offer in the first place is a mismatch in the customer journey stage. 90% of your contacts are not “in market” at any given time.
A smarter way number 1 could be a workflow reacting to clicks and open activities (while open activities are not a safe KPI anymore due to technical reasons). Resending a newsletter to inactive recipients after a period of time can sometimes be best practice and can easily be done. But avoid bothering your reacting e-mail recipients with redundant and irrelevant content.
The smarter way number 2 could be instead of sending the same offer over and over again, to work with lifecycle stages, use measured activity on your contacts to retarget them with appropriate ads, and trigger another e-mail offer when they show signs of being “in market”.
If you still plan to resend exactly the same e-mails in an infinite loop, you check out re-enrollment settings on a workflow.