There are a ton of little ways that you can greatly increase your storage space. The real secret is to make the most out of all the storage space that you have on the wall. Your walls can be an untold treasure trove of storage space if you make the right modifications.
Just think about getting a wall spice rack. If you cook at all, then you will at least have some spices and mixes. You now have a good place to put them. Buy a wall spice rack and you can just stick them into their place and always have them nearby when you need them. If you just don’t have any wall space left in the kitchen, you could always look into a hanging spice rack and see if that might fit in better with your style.
You also need to get a closet organizer. This is a really basic idea. Your closet could be used much more effectively if you just have more shelves and more flexibility in your storage options. Getting a closet organizer will let you hang things on the doors and gain shelves in the middle of the closet. You are doubling the capacity without changing a thing.