I don't want to lie to you, basically getting a back link to the new site is quite difficult. First of all you have to check the on page of the site, whether you have done it in a proper way or not. Later you need to check your content of the site it should be unique and match to your business. At least focus on you off page activities, for instance, publish your blog or content on social media, take all the benefit from social media sites. Do quality work, forum submission, article submission, question & answers.