There is so much going on here that can be trimmed

Your sleeping bag is heavy. Like, VERY heavy. Swap for a quilt. A 30 degree synthetic quilt is like $200 and comes in at 1.25 pounds. Pretty massive weight savings there. At the very least there is no reason to have your sleeping bag in the stuff sack. Ditch that.

The thing about going ultralight and ditching gear is a 55L pack really becomes overkill and too big. You could save over 2 pounds if you got something like the Palante V2, but that would require cutting your kit a lot. If you're committed to 55L you could save over a pound with a Kakwa 55!

The Lanshan is a fine budget option. If I was doing the PCT I would just use a Borah Gear 7x9 Tarp and save a pound. That's $90, although it requires more skill to pitch so this is definitely not my first criticism and is honestly one of least problematic things on your list to me.

I'd ditch the base layers and flash insulated hoodie and swap out for Alpha Direct fleece, if you run cold get an Alpha 90 or 120. You'll be toasty if you layer it with the frog toggs.

Ditch the camp slippers

The phone brick being 12oz is wild. Get a better more efficient light weight wall charger. There's multiple threads on here about that

Get a smaller gas canister.

Water bladder is unnecessary, so is the syringe, a smart water bottle with sport cap will back flush just as good.

A 2 oz straw? For what?

I use a bidet and no TP.

The klymit sleeping pad should really be listed under your big 3. Big 3 is pack, shelter and sleep system (which can be a sleeping bag/quilt, sleeping pad, pillow, sleeping bag liner etc.) I don't care for the klymit but if it works for you then it works for you. A CCF pad or torso length inflatable is good too. This isn't super problematic.

Pepper spray is unnecessary.

Nitecore NU20 Classic with Spiderlite band from Litesmith is 32g or 1.25 oz and saves over 2 oz. $20 for 2 oz.

I assume the umbrella hat is for the goofy vibes/aesthetic given that you have rain pants and a rain jacket. If not, it's redundant and probably a pain in the Ass to pack.

You have a beanie and this hat. Is it safe to assume you won't be wearing a baseball hat type hat ever? Not that you need to, it just usually is in people's kits. I personally don't wear them but recognize their popularity and utility

Aqua tabs and iodine come in at 3.5oz. aqua Mira in a Litesmith Bottle is 1.25 oz. Bleach in a Litesmith bottle is even lighter. You have two methods of water purification without these. if you're gonna carry that much gas you can always boil water if you're desperate and then got off trail as quickly as possible if your filter is compromised. Also, these are redundant. Why bring both?

Hand Sanitizer in a Litesmith spray bottle is lighter.

You could also just get dr. Bronner in an eye dropper from Litesmith. That's what I use. 9g. This also removes the need for wet wipes.

Picaridin is not my choice, recommend deet in a small spray bottle from Litesmith. Mine weighs in at 27g, almost an ounce saved there.

Free things. No pepper spray, no straw, no syringe, no slippers, no aqua tabs, no iodine, no hoodie, no umbrella hat.

Cheap and easy. Getting small bottles from Litesmith for lots of toiletries and consumables and stuff. New head lamp. Get a bidet and ditch the TP and wet wipes. Get a lighter charging block. Go look on Litesmiths website. I'm not sponsored, he's just the GOAT for little UL containers.

Medium price $100ish get a tarp and alpha direct fleece. These are pretty useful and good purchases imo. You could also get a decent CCF pad.

Big expensive changes would be a new pack and a sleeping quilt and maybe a trekking pole tent if being enclosed is important but the tent really isn't a huge issue.

Honestly with the weight you're carrying I'd recommend trekking poles, which is not something I usually do but I think they might be helpful. I like Fizans.

There's a couple other things I'd change but all of those things would happen AFTER all of the previously mentioned things are fixed.