Storage usage can be reduced by releasing old images.
Performing a “Release” of images removes the links to the full size images in a competition. You would only do this for competitions that are over 5 years old where you needed to reduce your storage use to comply with your Visual Pursuits subscription. This is rare.The “release” action does NOT delete the images. It also does NOT delete the image references in the competition, as thumbnail images will remain. If you do not want an entire competition, you can delete the competition.