I think it would require way more than that to be successful, even if the monthly posts were super-long. I'm thinking a post every day or every 3 days is a much better strategy.
I think there's no magic formula of how many articles you need to post everyday. It depends on the quality of your website, your keywords, your competitors, your content,...and many other on-page factors. However you should try to focus on quality instead of quantity, I think so.
And beside the articles you need to post on your own website, you need to spend time to do backlinks as much as possible, and don't forget trying to get quality backlinks too.