I hope that this is not taken the wrong way, but I do wonder why you chose to pick up another character if you are aware that you are having activity issues and that you are struggling with motivation.

You do tend to apply for characters on what seems to be impulse, but I have noticed that they do not last very long. Kallen seems to be the character you have held onto for the longest. I well understand that urge to apply for someone new and fresh to play with, but when they don't last very long, it can be a bit discouraging to try and form CR with your newer characters because one is never sure how long that impulse will last.

I will say that when you do apply for new characters, they are very strong right away, but their momentum slows after a month or two until they are eventually dropped. I would very much like to see this kind of excitement and drive in Kallen and Korra.