Whenever there is less storage space it is always wise to think vertical instead of horizontal. And the same goes for your kitchen as well. There are many ways in which you can take advantage of a narrow space with some length vertically.
Creative Narrow Pullout Racks to Duty as a Pantry Storage
Divide a Cabinet in Narrow Vertical Slots for Storing Baking Trays, Cookie Sheets and Chopping Boards
Hack The Space Along Your Cabinets with Floating Shelves
Install a Vertical Lid Rack Along The Cabinet Door Back
Create a Vertical Doorway Storage and Hack The Space at The Either Sides of Your Kitchen Door