Your store looks really great! products are presented very well, and pricing looks ok, your on the right way, no reason it wouldn't sell!
In regards to Facebook ads, how many visited and how many added to cart? make sure your ads investment or marketing efforts leads to getting value or learning who is your most likely to purchase audience by capturing the people who visited your store, added to cart and purchased, try using Facebook ads with our new Smart Ads app to help you get there fast and design your first audience targeting: with https://apps.shopify.com/my-smart-ads , It creates professional dynamic collection ads and slider ads with products catalog on Facebook for your store and help you with constantly improving your sales with introducing better new learning audiences on Facebook.
Good Luck and all the best!
There's an open discussion about the black screen I mentioned on checkout from last few days: https://community.shopify.com/c/Payments-Shipping-Fulfillment/Checkout-page-is-completely-black/m-p/...
Hope you'll find what's causing that.
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