Being organized is directly related to two factors: the amount of available space and the number of items to be stored in that space. When the volume of items surpasses the available space, clutter results.
There are several solutions: hold a garage sale or organize the items, both of which entail identifying anything that can be disposed of or relocated. Or, you can just give up and move to a more spacious home. The best option may be to devise a more efficient way to organize the items.