Generally speaking water seeks it's own level or "Like attracts Like." In other words read and comment on hubs written by others that are in line with the subjects you write about.
It's not unusal for someone to read your comment and out of curiosity click on your profile to read your hubs.
This may lead them to want to follow you.
There are some people who will automatically follow you if you are following them.
Answer several questions!
Again a person may decide to click on your profile to view your hub subject matter and if they like it they may sign on to follow.
When it's all said and done your reputation won't be based upon the number of followers you have but the quality of the hubs you write. Remember Cyber Space is forever!