Cal here from Shopify, thanks for reaching out to us. I understand that it can be frustrating to not be able to figure out why your store is not making sales.
Have you identified your target audience? What marketing strategy have you currently? Would you mind including a link to your store, so we can take a look and make some suggestions?
Few days ago, I've been introduced an interesting app called Shoppable Instagram Gallery.
It will help you connect your Shopify store to your Instagram, so you can post your product photos and descriptions on your store. It really helps me to encourage my customers to buy more products.
You can try if you want.
Do you mind sharing your website? I can have a look and give you some feedback.
Without that, here's some advice: have you thought about using product labels/ stickers to highlight your bestselling products? You can use these “mini-banner” kind of labels on top of your product images to guide user’s attention to the right product. Apps like Modemagic can help you apply product labels.
I hope it helps.