THIS IS INCREDIBLY IMPORTANT:
The first thing i saw before going through the rest of the store was the trademark and copyright infringement. Firstly, trading under M&S or using that name commercially is illegal, as that name is taken of Marks and Spencer. Secondly, you absolutely, under no circumstance can sell any branded products, such as the Avengers ones you sell on your store, this is again an infringement upon copyright and will lead to your store getting taken down and you may possibly be sued for this. The only ways you can sell branded products is if, they are second hand or if you are an authorized distributer
Apologies if i come across a bit blunt with my answer, though it is just absolutely vital that you don't sell or trade under protected brands, just to prevent major legal issues later on down the line. It is imperative that you remove these products from your store before trying to get sales.
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I’m not completely sure on the need of purchasing a new domain, but to my knowledge, unfortunately, you will need to invest in a new domain for your site.
After removing the copyrighted items such as the Avengers Merchandise and such, and following the advice of others who commented on this post as well, you should be all set to start promoting your store using Facebook Ads, Instagram Influencing, etc to drive traffic to your store. There are plenty of brilliant resources on YouTube that explain how to go about advertising on these platforms.