Shoe piles and a full-up closet are a common issue for a lot of people. There is a simple rule that you can follow. Just find a little time, take out all the shoes you have and see which ones you wear most. Put them nicely in the front and the rest you place in boxes or bags (to avoid dirt) in the closet. In case you there´s no more space left in it, you can always use shoe racks.
Other shoe storage tips: Store leather shoes using a shoe tree, this will help retain the shape of the leather. If you can’t use a shoe tree (e.g. for strappy shoes), stuff the toe cap with newspaper or tissue. Never store or dry leather shoes near direct heat.