SEO has to be on the list. If you don't know what it is, study. As much social media as possible, FB, Twitter, StumbleUpon, Reddit,etc. Articles with reputable sites in which you can put backlinks More SEO. For a way to use a traffic exchange for retweets, which are effective and penalty-free, see: http://lastunturnedstone.blogspot.com/2013/01/how-to-get-twitter-retweets-without.html
These tactics will get traffic, yes. Not FAST traffic though, especially SEO. When I hear fast traffic, what comes to my mind is Facebook Ads or PPC. Out of everything you listed I'd say the fastest way to get traffic is from Guest Posting.
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