I think blog comment is the easiest things of seo, and no experts is needed for it. i have creativity so i can do this. you know blog comment is to create more and more backlink for your website. the more you have backlink, the more you reach the top position on SERP.
i know commenting on different blog is similar (except a little exceptional). if i am selected , i will regularly comment with similar keyword to the post on various blogsite that's similar to your website, then with an excel sheet i will make a workproof that you will obviously like most.