One of the easiest ways to increase frequency of your customers to your restaurant is by refining the quality and reliability of your food, the service and the ambiance at your restaurant. While improving food quality can be a costly effort, there are some cheap ways to make sure you’re serving up the best version of yourself. Smiles are free and infectious, and with over 85% of customers believe good service to be a significant characteristic of a fast-casual restaurant, training your staff to be lively and cheerful is a great place to start when trying to enhance the restaurant ambiance. In general try to treat everyone who walks through your doors like a regular.