How deep are the shelves? They shouldn't be any more than 12"D, especially along the 5' wall. That gives you 24" of aisle width. While that's a bit tight, it's enough to load/unload food in the pantry.

12"D is the "sweet spot" for pantry storage. Not so deep that things get lost in them but deep enough for the majority of items...cereal boxes, cans 2 or 3 deep, pantry containers, most small appliances, etc.

You could put deeper shelves with baskets on them, maybe even pullout baskets/shelves for things like potatoes or very small items.

For the shelves themselves, I would either use solid shelves or put plexiglass on the shelves so things are balancing on the wires and to prevent spills from going from the shelf where the spill originated all the way to the floor, including all over the items stored beneath the spill.

We had wire "pantry shelves" in our old pantry and I hated them!

What are you trying to accomplish? current set up looks pretty good. you could make it prettier (ie solid shelves would be lovely and practical!) or some deeper cabs in back if needed. but hard to fit much more stuff in!