Choose the most efficient way to reach your customer at a price you can afford. Little or no marketing will surely cost you sales. Marketing is not a sure thing, some things work and some don't. Look at several options. You will get a feel over time of the best promotions to use to reach your customer.
Marketing does take time.
You should market with commitment and consistency. But, those 20 times can be a mixture of different marketing techniques. Your research will tell you what is appropriate for your customer. You should at least think about marketing every day. You should be constantly promoting your business.