In this case, the job title on the business card is written as follows:

1. If you are the owner or person in charge of the store, you can choose to use "owner" or "manager" as the job title.

2. If you are responsible for the daily management and operation of the store, you can use "manager" or "operation manager" as the position.

3. If the main responsibility is to sell goods or services, you can use "sales consultant" or "sales representative" as the position.