The advantage of updating your formal post are numerous and positive to you, I have once come across a post that one of the commenters pointed to a step that it had been replaced and this was as a result of not updating blog post as at when due. Cultivate the habit of doing that henceforth.
Conclusion
The easiest way to increase your traffic for free is been mentioned and highlighted above, all these tactics are very potent and evergreen, because your traffic will be boosted fully and real, some of the methods may work perfectly on the short run and the rest goes for long term traffic building. The method to adopt depends on your techniques of optimizing your blog which proves your style, time and industry you belong. You can add your comment and your opinion about the topic.
Greatly appreciated!
To Your Success,
$haun