You've got the right idea creating a one product store. There are two things I'd like to provide feedback on; your stores first impression and your product choice.
First, your stores first impression. I would recommend working on the overall aesthetic of your store. I can tell you've put a lot of time and effort into your stores design, however, when you are choosing colors, fonts, the overall look and feel of your website, you have to put personal preference aside and instead design your website around what would appeal to your target audience. The bright yellow is quite hard on the eyes and unfortunately in it's current state, it doesn't look trustworthy.
With your product, again, right idea doing a one product store. I would just make sure you have a winning product on your hands. A good product choice should have these qualities:
We did a video on how to find winning products and we also regularly post a collection of winning products on our YouTube channel:
Once you have settled on your winning product/products, you can expand your sales channels and promote your dropshipping products on Google Shopping using the AllFetch Google Shopping Feed app (it's free). It allows you to easily syncing your products from your Shopify store to the Google Merchant Center.
I'd like to help you with your store more so I'd invite you to join a free training we have coming up. We cover everything your store is struggling with: high traffic with no sales, spending on Ads with no return and visitors abandoning cart. We will help you develop a profitable ad strategy and learn how to generate free traffic, transform your Shopify store into a professional. trustworthy store that customers want to shop at and help you find winning products that people can’t wait to buy. Our free private Facebook training is happening on April 26 – 30, we will be going live every day at 1:00PM (EST). You can sign up here. Really hope you join us!
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Best of luck!