Make a copy of your packing list. Pack in reverse order, priority items packed last, like you normally would. When you do this, you'll catch yourself tossing the stuff you really don't need, but want, in the bottom of the bag. Scratch off whatever you don't actually use when you get home from each trip. Also, look at places that teach or give guided mountaineering/backpacking trips. A lot of them have detailed required gear lists online. More often than not, if you don't see it in their list, you probably don't need it.
Consider replacing some of those under layers with silk, get a few silk ski masks that you can fold/roll up off your face to use as a hat. A few pairs of silk gloves. That sheds a lot of weight and bulk, though all relative to the trip lengths. Do you have a scale that reads grams? Weigh your matchbox against a Bic lighter. I'd rather have the lighter than the matches.

Talk yourself into things like "everything MUST be flat packable", and, "everything MUST have multiple uses". Almost impossible...still, those two will kick your creativity into gear. I winter trek a lot, and cutting weight is always on my mind - but only if it's practical, with my well-being at the top of the list first. I don't consider myself an ultra-lighter, because if I'm goin' campin', I plan on eatin'... a lot.

If there's no fire restrictions where you hike,cook all your meals over open fire. Making (or buying) a .016" thick stainless steel backpacking stove that burns wood instead of an alcohol stove or regular backpacking stove for your back-up cuts some liquid weight off. Or you could do the Esbit thing.

I have a frameless pack with a hydration pouch, for 2-4 day non-winter treks. I keep my cooking grate and my sleeping pad in the pouch. Now I have a sturdy frame and padding. If you go that way, make sure it all fits before you buy. Some pouches are tight and that might cause bulging into your back. If you use a self inflating closed-cell like I do, just experiment with the valve to try different back support levels.

The shelter system is based on what you can afford, and prefs. Out under the stars in a bivy/tarp system? Or a tent? My 4 lb two person tent has been good enough, but middle age is creeping up on me. I am considering weighing up a set of custom carbon fiber poles against the dac aluminum ones to see if there's significant difference in weight. It can get pricey. I've also been eye-balling the Go-Lite Shangri-La 1 in case I want to drop a little more weight in the future. The tent body, which is really just a fly, weighs 1 lb.,plus 3 ounces for 6 stakes and the optional floored nest is 15 ounces. Go-Lite didn't list that as the packed weight, and I would assume it also comes with a stuff sack, but who knows. There's no included poles because it's pitched using 2 trekking poles or by hanging it with 2 lines. If you don't use trekking poles, you can custom make poles, or use some sticks you find laying around.

Thinking about how you plan, prepare, and cook your meals can change things enough to where you may decide that the fry pan can be kicked to the curb also. Unless it doubles as your lid and/or plate. I just stew or fry in my pot, eat from my pot. Aside from oatmeal, all the other food types are grilled or kabob.
Pre-cooking certain foods can have it's advantages, like removing excess water weight, grease, it lowers the chance of spoilage, and you just have to re-heat instead of a full cook time. If you like dehydrated foods and snacks, you can save a lot of money on camp food if you buy a home dehydrator and do it yourself. Personally, I dislike those pre-packaged dehydrated foods, because they taste like crap, cost too much money per portion, have less nutrition, and force people to carry more water. That same water weight can be fat juicy steak. You can control how much re-hydrating you need with a home kit. Overall, you'll eat better, have more fun, and can pump the savings into better gear.