Hi @Brycekauffman ,
About your requirement that deletes a large number of subfolders within a folder, you can refer to the following screenshots:
Step 1: Create a Recurrence trigger set 12 Month.
Step 2: Add Get Files action to get these files in the library.
Step 3: Add Filter array action to find the target Master folder, e.g. Hub/Test2.
This function deal with the folder path:
concat(item()?['{Path}'],item()?['{Name}'])

Step 4: Create action Apply to each to get item, then put Crate Delete item action into it.
P.S. Please enter custom value into “List name”.
ID: item('Apply_to_each')?['ID']
Step 5: Create a folder with the same name as the original master folder.

Please have a try, I hope it can help you.
Best Regards,