from increasing the backlink of your site, by doing the following works.
1. add to all site directories with pageranking of those directories
2. any places where needs the domain, pls enter your own domain even the membership registration.
3. build the own social media and often post your link there
finally, do not need to take the time in the other site promotion where their site set no-follow command, it means request the searching engine do not need to take such link.