Best strategy is remain aware through testing stuff YOURSELF -
It's hilarious how predictably circular trends everything SEO move about. 2 years ago the only one talking about the importance of content was Michael Martinez, while everyone was building link farms. Throw a bunch of junk up and see what works. Best strategy is scientifically documenting all the tests you run.
Geeze... I was reading a print I manually made of a client SERP from three years ago, then again the same from last year, and again 3 weeks ago. NO RAVEN, NO AUTOMATED PROGRAM. Just taking the time to collect a pretty long period of historical data for one client vertical. You'd be amazed what you can learn from something so basic.