How to clear up storage space?

Recently when trying to add content from the vault to a level such as the open world collection, a message shows saying “cannot install Insufficient storages available at Unreal Projects\MyProject 6,527 MB required. Available free space 1,658” but I’ve just created this level and every time I’ve deleted one and made a new one the free space has dropped, it used to be just shy of the 6,527 it’s asking for.