Email addresses previously marked as "Unsubscribed" will not receive reminder emails from the original list. To ensure they receive future communications, you need to create a new email list that includes these addresses, update their status to "Active," and send a fresh invitation.
Helpfile for creating New Email list: https://www.questionpro.com/help/manage-email-list.html
Once you create new Email list, click on Unsubscribed count.
Screenshot: https://monosnap.com/direct/KAQSScDTRwFbXNNgZj7JLcV2dWpHpX
On the pop-up, click on Email id which will open a pop-up window. On the status, select "Active" and click on "Update changes".
Screenshot: https://monosnap.com/direct/UEtFjFjb7eB6Psp3LwxBIGYKtrWWdy