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Honestly, I wouldn't worry about Alexa rank at all. Its not a good metric on valuable traffic. Your site is for movies and more entertainment content which doesn't really translate to users who have an Alexa toolbar, thus making it irrelevant what Alexa rank you are. If you were a SEO blog or webmaster forum or anything in that medium then Alexa rank can decrease much more and reflect the users that are visiting your site. Alexa rank, Quantcast, Compete all have their own systems and none are 100% accurate of real worldwide traffic.

Thanks.