"In e-commerce business, it is important to know your target audience and what they need. It will be a huge asset in establishing your online presence the promotion of e-commerce website to Social Media Sites like facebook, twitter, pinterest, etc. However, promoting your E-commerce website on social medias may vary on the products and services you offer.
There are so many way.
Get registered with all the search engines
Buy keyword searches and ad space from Google, yahoo, bing and Msn.
set up videos on youtube . You can also pay some freelancer on SEOclerks to do it.
Make keyword research for your website than you implement some off page important tasks like
guest posting
web2.0
article submission
guest posting
video marketing
rss feed
Now a days very tough competition in e-commerce website, because of many big website is online so if you want traffic increased try use social media platform. PPC campaign also use.