There is only one way to increase your commenter level. By commenting on other people's hubs. The more and faster you comment. the more and faster your level will increase. It helps if you comment on things you like obviously and there is no shortage of great content to comment on.
I just commented on the things I liked reading and really didn't pay any attention to the level I was at. As it meant nothing to me. It still doesn't.
I know it means a lot to some people but as long as you are honest and enjoy what you are reading and commenting on. Forget about the level you are on. It really is irrelevant,