Be resourceful about storing items. Instead of the usual cabinet shelving hidden behind doors, have deep drawers installed in your below counter spaces. It makes it much easier to find what you are looking for, and makes the rear space far more usable.
For visual “space”, instead of the typical upper cabinets, install shelves on the walls. This gives a much more open appearance, and still provides some storage space. A pot rack and a wall-mounted knife holder stores more items in easily accessible locations and keeps the drawers available for other things.
Think about how you use your kitchen space and arrange major appliances and the sink accordingly. You want a smooth work flow between the refrigerator, sink and stove; these are the primary cooking and cleaning locations in the kitchen. A designer or experienced contractor can help with layout; or check various layouts on the internet and friends kitchens, and think how those might work for you.
Use a consistent color scheme that flows from the kitchen to adjacent areas, such as the eating area and the living room. Remember that lighter colors tend to make a space feel larger.