Grammar - Depending on the language you use, blogging just makes it imperative that you are reasonably good with your grammar skills and proficiency if not a master. Remember your audience is a mix of both; the ones who are experts and the ones who are not.
The best method to attract traffic to your blog is to write good content regularly and share on all social media sites at a time when your audience is online.
Originality - Focus more on the originality of content and on a consistent basis. It is a habit you will need to cultivate.