I can say that infographic is part of content marketing. However, creating one could be a tedious task because this is not just your average graphical presentation or something. You need to present accurate data and commission a survey before creating one.
It's hard to get posted on Wiki! Trust me I've experienced first hand! :) However, by following their strict rules you'll get by. But first things first, avoid having a content that blatantly promotes your site. Also, Wiki values your site's verifiability, so before submitting your site make...
1. Uninteresting/Irrelevant content.
2. Poor quality of writing.
3. Site does not have a proper internal linking or SILO.
4. The site might have some technical issues.
When your content or articles aren't ranking, you should ask yourself first if there's something wrong with your site...