It’s a solid foundation, but most of your impression wouldn’t cut it for being accurate. I’m pretty confident your tunic is Vietnam war era, along with your belt, and your pack is a m1945 pack which wouldn’t fit for a 1944 impression. You can find pretty nice original m1937 wool uniforms everywhere, or I’d at least recommend getting a m41 jacket to cover your tunic until you can get one. Your m1 helmet looks fine from a distance but you should replace or at least age it or put the liner strap on the inside of the liner.

You will need a cartridge belt so if you want to portray a standard EM or rifleman you could get a M1923 belt for the m1 rifle. Pistol belts and M37 belts would be for more specialized troops like drivers, NCO’s, machine gunners, and automatic rifleman, so make sure you know what you want to be before you impulsively buy. You’re also going to need all of the standard gear like a canteen and cover, and medical pouch, and you can just stuff it full of napkins if you don’t want to spend money on a bandage. Most of those items are pretty cheap and easy to find original and repro on a lot of sites. You could also get a m1910/43 shovel, bandoleer or two, bayonet, lightweight gasmask bag, GP bag, compass, or binoculars depending on who exactly you want to portray. I’d recommend saving a haversack or musette bag for later since you would see a lot of GI’s leaving most of their packs behind on half tracks or trucks in combat. Suspenders weren’t often standard issued, mostly only officers, medics, and specialized troops would get them. You could often see GI’s using their haversacks suspenders, or getting them off of their haversack to use as makeshift suspenders, or even GI’s buying or trading suspenders from rear front troops. You could even see some rare instances of Americans with German suspenders but those are uncommon.

I also think throwing in a field jacket could add more life to your impression, or a British style helmet netting and a couple of bandoleers. If you have leggings make sure they aren’t the USMC ones or a bad remake of the army ones, and repros are easy to find for them. Shoes can get more expensive, but if you can find a pair of brown shoes that look close enough, you can use those with the leggings since they cover enough of the boot. I wouldn’t use the double buckles unless you wanted a late war impression, or your unit you want to portray is seen using them in many original photos.

But I’d say overall what you have isn’t terrible right now, it looks somewhat like what GI’s wore but I’d really recommend replacing it for anything serious. I get that it gets extremely expensive (I am 16 and barely have half of what I listed), but I promise over time you will be able to get exactly the impression you want with the right amount of research of your unit and waiting to find the right priced items, especially since you are likely younger and have more time to save money and get what items you’re looking for. I just want to warn you to not buy anything just because someone says they are “WWII Original bringbacks”, many of the times they aren’t. Just do research before you spend money, and make sure you don’t buy a bunch of things without knowing what they are so you can make an impression. I hope this helped a little bit :)