create a unique content for your site...with your keywords on it but don't keyword spam your content that might hurt your site...then improve your link popularity...
Some Copyrighters assume that they Create their own And Unique Contents for Their sites. But I'm sure that they find a content through SE then they rephrase it....
Well, they do need to research a topic. The good copyrighters will stop there, and then write in their own unique style. To be honest, I have seen some major sites that have similar content on many topics. For example, lets say, the article is on treating a disease, you will find different sites (even the major, major ones) having simiar advice, whcih, I guess is to be expected.
1) When you create a site, don't think of search engines first. Think of your visitors first. 2) Make sure to add something new to the topic. 3) Try to have unique content. 4) If you're not good at writing, find an editor to look through your content before you add it to your site to allow for consistency in the writing. 5) Once you've done all of the above, you can pinpoint some keywords for inclusion in your text as long as they don't hurt the integrity of what's written.
Do what i did: After generating around 100 pages of unique content, i started letting my vistors create the content for me! Now I have several hundred pages of 100% unique content.
You can get 'user generated content' by soliciting comments on existing pages, inviting them to send pages to you for publishing, and/or opening a forum section at your site. The particular CMS i use has an integrated forum section, and it treats every new post as a 'page' ..