Have attractive signage outside your shop, because a schlocky sign says a schlocky business dwells inside. Look at what the competition does well and do it better. Look at what the competition does poorly and do it well. Look at what people would like to have but don't and give it to them in spades. Consider having a periodic customer panel that meets every few months and advises you on what changes they would like to see.
Customers expect quality.
So if you expect repeat customers, you had better give it to them. Give them quality not as YOU perceive it but as THEY want it. This means never being content with the status quo. Outshine the competition in customer service. Fail in this area, and the best product in the world won't save your business.