SEO traffic boosting techniques do not have to black hat. In fact, earning links that are highly relevant is a grayhat strategy that will get you far. From DiggityMarketing

Next Level Metro covers the latest off page search engine optimization techniques in our “Why You Are Not Ranking” (WYANR) written series. Not having the proper keywords placed in the URL, for example, can severely dampen the progress you could be making organically. Much of it has to do with you not receiving high-quality links, being too new of a site, missing keywords on crucial on page locations, etc. Be careful not have deindexed sites backlinking to you as Google and other search engines tend to be associative when identifying what your site entails. It may misjudge you as spam.