SEO is a lot like music. Specifically, the concept of 'theme and variation'.
Nearly everyone knows Beethoven's 5th Symphony (
YouTube - Beethoven's 5th Symphony )
and it is a perfect example of this concept.
0:00 - 1:22 = theme
1:22 - 2:43 = slight variation, almost identical to theme
2:43 - 3:35 = massive variation, re-iterating the theme in another way
and so on....
The result is one of the best/famous/etc pieces of music ever composed. In a time where there were no records, cds, record players, or any other 'media' besides sheet music and an actual orchestra to play it live, somehow, everyone who has even the least bit of culture at least has heard to first 5 seconds of this song. "da da da duh!!!" everyone knows this.
Why?
It's catchy
It's repeated
It's re-iterated over and over throughout the piece
It's in the theme
It's almost in he variation, but not exactly
Your website is the sheet music.
Other websites are the orchestras.
The sheet music to the average person is a bunch of gibberish scribbles that doesn't give anything to them.
the orchestra playing that sheet music, everyone can benefit from, enjoy, and comprehend what the sheet music was supposed to relay.
you can self-link your keywords on your own site all you want, but they will ultimately offer little ranking value. However, if you are able to get others to link to site, or even 'spam' yourself on other blogs in a professional matter (offer a genuine reply with 'more detals at X link') and target your keywords using the theme and vairation concept, and you will be well upon your way.
You'll likely never rank for pizza, nor for best pizza, but you might for best pizza nyc 8th ave. which re-iterates the long-tail concept. If you posted on other pizza blogs about your 8th ave pizza stand, your best pizza stand in nyc, best food on 8th ave, street meat nyc, and other 'theme and variation' of phrases, you might just get truly targeted visitors to your truly targeted phrases of choice.