First, do not delete the hub. I did this a couple of times and my score took a nose dive.
Try "tweaking" the hub by editing the title, and make necessary changes to bring it up to date. As an example, I wrote a hub last christmas on childrens gifts. Obviously, once the holidays were over, it would not be applicable. I changed the title to birthday gifts and did some editing in the content and images. Worked beautifully.
Write as many "evergreen" hubs as you can.