Ignore them, they don't even know how to go viral on IG either. The only sentence you need to know is "Content is king". Content stays above all. I'm not talking about high quality pictures, or shit like that, I'm talking about content that has to be liked by the Instagram users. You have to think about what content will lead the IG users to like it and tag their friends. You need a feeling for that, which you can get by trying out over and over again. You have to be the psychologist, getting inside the mind of the IG users.
Content is the key to go viral, while there are some tools that will help to get the post go viral. Those tools are either the likes of your own followers, or the likes from other accounts, which lead to the point where their followers can see it. After that, you can guess.. the only thing that matters is content. Because once people see your post, it all depends on itself, to let the Instagram users boost it to the explore page..