I took a look at your store and I find it to be pretty neat.
I do think that bounce can be caused by so many criteria.
Sadly, just by changing little details in the design, it is not possible to increase sales rate significantly.
I thought I will give you some pieces of advice on three aspects:
The product page design that you have is full of functions and details and I respect that. It is better to give a little more information than a person needs than giving less. Therefore, I suggest keeping up with that. And if you want to make the page shorter, you can add a section "Description" that will show the details only if a person clicks on that.
The biggest reason of bounce is that visitors are not sure if they want to get that item, or they do need that item at all.
In your case, I would recommend driving more targetted traffic. For that you have to know where your potential audience is "located".
I suggest working in partnerships with other companies that sell complementary items or services.
If have not worked in that direction yet, here is a template offered by Shopify to help create a business plan https://www.shopify.com/blog/business-plan-template
This is the best way to get inspired. A lot of the times people have faced issues like ours and just simply searching for sites like yours with high sales will do a great favor.
I myself have used benchmarking with all the startups I have had. Take advantage of that!
Hopefully, I managed to help you, if so let me know by marking this post as a solution or reply for more detailed information.
Your store looks very professional and captivating. Facebook ad will help you to get more and more traffic but you have to make sure that your store is engaging enough to capture that traffic and convert them into paying customers. You should add loyalty and reward program to entice your customers and convert them into paying customers. You should add web push notifications to retarget your customers even when they are not on your store. Start using email marketing and automation to reach your customers. This will help you in increasing the conversion and retention rate. Also, you can add a countdown timer to bring curiosity amongst customers to purchase a product. To get all these things in your store. You can install the app AiTrillion.com. It has all the features in just one app. You don't need to install multiple apps. It will help you to increase engagement and will boost sales.