Changing Subscription Plan - Removing worksheets and workbooks

Hi, I can't access any of my workbooks because I have too many for the free subscription and my current subscription is expired. But I need to access the workbooks to be able to delete them. How can I do that? Also I have way too many worksheets for the current subscription. I have started deleting them but is there a way to select more than one worksheet to delete at once? I have to delete over 200 worksheets and 1 by 1 is very tedious. Thanks in advance to anyone who can assist.