Agree about taking everything out first. This cabinet seems to be used for surplus items for the most part?

Then triage by usefulness so less used stuff is up high and stuff you need to get to is near the bottom. Some of the foil/plastic film boxes are duplicates I am assuming? They don't all need to be in prime real estate.

For today find some boxes of any sort that are about the depth and width you need. You'll likely have to make them yourself. Cut them down a bit so they are a tall tray so things won't fall out and load them up. You might try two boxes per shelf if you have some smaller things that need to be kept there.

If that works out meaning you are no longer losing things at the back of the deep space and it's easy to access then install drawers on the lower shelves and find [more likely have made for you] shallow light weight bins for the shelves above shoulder height or so. You will lose a lot of actual cubic inches of space due to the cabinet frame but not having to dump and rummage saves huge amounts of time and aggravation. I've put boxes in most of my cabinets and no more things squished into way back corners to be forgotten about!

Definitely add more shelves so you don't have to dump and sort to get to what you want. I just had plywood cut to measure as I was covering shelving with sticky shelf paper and they didn't have to match.

If you can cut the shelves back so you can hang shelving on the door and the door itself is sturdy enough to hold some weight that's another way to gain functionality. Cut the shelves 4-6" back from the door, use the same bin and drawer method and add shelving to the back of the door. I recently had the revelation I could do that to one of my cabinets so spices could fit on the door without worrying about the shelf spacing. I'm limited to where the support brackets are located of course.

Amen to everything tartanmeup said! For the long items like foil - perhaps (if the cabinet is deep enough) there may be space to hang an organizer on the inside of the door to put those in. (if you could still close the door, of course!)

Here's another thought on the process: it's very possible that the things you are keeping in there would serve you better in a different location, and you have other things that could go in this cabinet.

I like to think in terms of "prime real estate" in the kitchen: the things you use the most get the best location (ideally near its point of use). A deep cabinet is well suited to large items: a stock pot, large mixing bowl, extra rolls of paper towels, cereal boxes, small appliances you don't use every day. Look at the rest of your kitchen - do you have big things taking up prime real estate that don't deserve it? Rearranging where you keep things might help.

As for making the best use of the space - pullouts would help a lot. I built pullouts for several of the kitchen cabinets in my Mom's apartment, and they have greatly improved the function of the space.

Good luck!

Seems like a lot of duplicate items, thin out. Toss totally unused items. What's in the bag on the bottom?

I might suggest installing pullouts.

ShelvesThatSlide.com will make them in a custom size, and they have good instructions for how to measure and install.

There's also the idea of a full-unit pullout pantry. You access the shelves from the side. There's a ready-made one that's really expensive, but if you're related to someone sort of handy, they might be able to make you one for much less (the slides would be the most expensive part--you can do it with heavy-duty drawer slides, or there's a frame that's just over $200: https://www.houzz.com/products/pantry-pullout-door-frame-45-3-4-58-7-8-silver-prvw-vr~111206071).

Also, changing to shorter shelves will give you back-of-the-door storage, as well as side-wall storage. And it will keep you from having stuff buried in the back that you can't see or get to.



premade pullout pantry the right size for your cabinet:
https://www.houzz.com/products/pantry-cabinet-pullout-11-1-2-x-22-1-4-x-45-1-2-prvw-vr~14561889


As for the boxes--Sterilite makes a plastic storage box that's not a bad size--it won't reach all the way to the back.
And it's sort of too tall.
http://sterilite.com/SelectProduct.html?id=683&ProductCategory=252&section=1