You've stumbled upon the million dollar question. If you figure out a way to get a lot of authoritive links (for free), be sure to let me know. You may have to consider paying for them on authoritive sites that are not your competition. Also, be creative. Try to find sites about topics that are related to yours but may not exactly the same. Get links on those sites. Most search engines are better understanding context and related topics, and these links will help.
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