In order to maximize exposure of your blog you need to bring it out infront of the world. Off Page SEO is basically a way to get out of your cocoon and spread your work infront of the eyes of people and in that process the more you excel the more people will know about your work. The more people see and like your work the more they will share and hence ultimately search engines like google will also love your content. It acts as a domino effect one thing effecting the other in a positive way. Without SEO your content will not reach its potential