Your homepage suggests that you are selling cosmetics, yet the collections contain mainly apparel - that could be confusing - make sure that you focus on one niche and keep it consistent throughout the website.
If you are getting low traffic - and it's getting lower - then definitely look into where your traffic is currently coming from and why the numbers are lower. Perhaps your backlinks were disabled or posts removed? Look into that, and then analyze how you can improve it.
Of course there will always be things to improve, however I don't believe that the issues of not getting sales are related to your actual store.
It might be that you're not advertising enough or not doing that correctly. I think generating relevant traffic is the number ONE problem of every new Ecommerce store. It's quite a complex mission to create good advertising campaigns on Google and Facebook, if you're not familiar enough with the options available or the relevant audinece for your store.
You might want to try AdScale to help you with your advertising campaigns. It's a Shopify app that automatically creates and manage advertising campaigns for your store, using advanced AI technology.
What's unique about this app is that it use insights from millions of active campaigns in order to create a very accurate audience targeting that is tailored to your store and products.
You can learn more about it in this link: ecom.adscale.com
We usually tell clients if they have a lot of products to focus on their best one when advertising. You really also need to dial in the copy, imagery, and targeting. Its easier to sell a new product than a new brand!
We Craft Facebook Ads That Convert!
In your case, I recommend that you should update customer review as much as you can.
With this type of business, customers tend to purchase items having lots of reviews.
Keep sharing those on social like Instagram, Facebook, Pinterest. Also, post your customer review on social so that your potential client can reach those.
Please notice that the more you get insight into your customers, the more revenue you get.