I'm opening a shop and I'm willing to sell anything legal. I don't care what you want to buy, I care about being able to provide you with exemplary customer service and quality products.
With that being said, what do you want to buy??
I want to buy some clothes with customized print of anything related to bitcoin cryptocurrency. That will be cool if i am wearing it outside the house and go to mall. I want to suggest you also to provide and sell up gadgets like phone and laptop on your store. That will be in demand especially to a teens or kids.