Hi rohitnagpure336!

Social media is one of the great way to promote your website, just post a informative and relevant content and join related groups and join the conversations. Then, you can also promote your websites in different forums depending on their policies and the forum must be related on the niche of your business. Add your website in some directory submission sites' local listing and social bookmarking sites. If you have budget, Google AdWords is a right way. They offer variety of options depending on the goal of your ad.

Hope it would help you and goodluck!