Maintaining customer loyalty is an important marketing strategy for entrepreneurs, especially to increase product sales with a sustainable business. So business people cannot stop or stagnate even though it seems like the business is running smoothly. At least 35% of the total buyers who have used your product will buy your product again. Even though the first sale is the most difficult stage, you as a businessman can overcome this by providing benefits or discounts to customers, business people can also provide rewards for customer loyalty.