To get 20k to 30k visitors in a months you have to do proper On-Page and Off-Page SEO optimization for your website. For traffic purposes you do more and more social media optimization and continue do all Off-Page SEO activities.
Pintrest and Facebook is the great source of Getting visitor
I would say if you want to get traffic without investing any money then social; book marking is the best way for you to get high traffic. You can do it by sign up different social book marking sites. It is very easy and effective method.
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Promote your website on social networking website like Facebook, tweeter and G+. Or you can create video and upload on youtube that will definitely help you..