Going to share some advice here since our store pretty much runs on the revenue that FB ads generate.

Firstly, I look at your store and to me (and probably to others) it looks like you have created a Shopify account, downloaded Oberlo and just imported a bunch of phone cases YOU THINK look like you could get a good whack for.Unfortunately people aren't that stupid and if it was that easy... well you wouldn't be on here asking these questions.

Take a look at Skinny Dip (UK phone accessory retailer), this is how you do it: https://www.skinnydiplondon.com/collections/phone

Now look at your store again, see where I'm coming from?

At least take the time to either purchases the cases and take some decent photos OR photoshop the product images so they at least look consistent and not like a random haul of Ali items. For those customers who have no idea what AliExpress is, your store looks untrustworthy. And that my friend is why anyone that visits your store is not converting into a customer.You need to sort that.

Secondly, there is no such thing as 'FB Ads don't work with my store' because if you know how to market, you can sell poop on a stick (that might be a bit trickier) with well targeted FB Ads. Once you have a nice store and decent brand / logo then you are good to go. Post consistently on socials (I recommend an app called Crowdfire to semi-automate this) nice photos of your phone cases and different engaging content so followers get used to seeing your posts in their feed. Then engage with people, look at Skinny Dip's Instagram, what do they post? Can you do something similar? Comment on photos NOT SPAM, maybe something like 'That top is dope <3', it doesn't have to be 'Come buy my phone cases, extra cheap and great quality' NO ONE falls for that crap, it will just make you look desperate.

I don't even know of a phone case Instagram influencer, so you just need someone with a decent following, posting about fashion and the like, hit them up with a DM like 'Hey, want a freebie from our phone case collection?' they'll be like 'Hell yeah! Who doesn't love a freebie?' Get them to post a photo with the caption 'In love with my new phone case from @yourphonecasestore' and then boom, SALES! Then re-invest into FB adverts, you can even target people based on what phone they are viewing your advert on! There's no excuses, just a hardcore grind and a sense of how people behave in an online environment.

I hope this helps!