Business Idea to become a market leader
Aasan business tarika to become a market leader buy multi vendor ecommerce application.
Magento 2 Multi vendor is one of the example. It’s a complete multi-vendor marketplace like Amazon, eBay, etc.for the single store it is free but for the multi-vendor its cost check below link
then do affiliate marketing of the product check below link
And do advertisement in the social media like Facebook, Twitter, instagram and post video on YouTube, etc. of your ecommerce portal.
See more here