How do I get the maximum storage space out of a small room and closet?

I'd like to make more storage in my craftroom? I currently have to file cabinets with a old door on top for sewing table. I use the old filing cabinet for storage. Then there's two dressers in there I one to be used as a dresser, the other two stores some crap supplies. Did in the closet I have a bookcase and some plastic storage chores that hold old photographs and other miscellaneous things. So how do I get the maximum space for storage?

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