LAUNCH!
If you are in the mode of constantly prototyping before starting your store. Stop it, And Launch!
Your product will not be perfect. And it probably won't sell. And what you customers think will not be what you think.
The only way to a successful product is through all of that. But the product has to exist. 80% good is infinitely better than not existing.
Launch your product today. The worst that can happen, people won't buy it. But then you have the feedback. Sitting in a hole and "preparing" is just an excuse to not engage with the actual customer.
"But I want the customers to have a good result." Show them what it is and present it honestly and the grown adults can make their own decision. Stop making the decision for them.
Go launch you product. Right now.