Some good points made here but if you really want massive traffic, you need to do ALL of them and more. I see too many people fixated on just a couple of methods. That is NOT natural. Do them all and you’ll be surprised how much traffic you can generate.
You also need to stay current on everything from Google algo changes to the new up and coming social networks. For those of you who have been around for years, just think back to the sites that dominated this space a few years ago and think where are they now. Most have disappeared from SERPS.