Evaluate the backlinks to your website using link checking tools.
If you see some spammy links, use the google disavow tool to tell google not to index those backlinks to your website.
The content of a website matters a lot.
Is your content unique?
Make sure you highlight the important features about a product.
Give a nice starting about why the product is good and how the company which is producing the product is continuously adding new products.
Do some off page seo like:
Blog commenting on dofollow blogs.
forum posting with signature.
If it is your shopping website ( you yourself sell products), offer good incentives to affiliates who promote your products so that more and more people will
start to promote you.