Very good question, I have done some research and find a very good article also about promoting e-commerce website. Basically it said: Investing in resources by improving sales process or organizing training for sales team in order to increase sales volumes. To be successful, your business have to increase the number of orders from customers as well as ensure products and services ultimately to the customers.
Not only focus on offline channels of sale and distribution, now the market also more opens with online business environment. If you quickly launch online sales website, promote online marketing activities, use the form of online advertising like Facebook Marketing, Google Adwords …, you will see a remarkable increase in revenues and the number of goods sold.
Here's the full article:7 Life-saving Tips About How To Improve Business Sales
Hope this can help you solve your problem!