I believe that a more aesthetically pleasing look to the forum would do better. And perhaps adding in another section for higher level players that aren't necessarily advanced. I consider myself a high casual roleplayer and find the stuff on casual to be lacking in many cases however I can't consistently make giant two paragraph plus posts for roleplays. It's not in me to do that especially considering it may end up dying. 

I would also like to see a reputation system added when you can anonymously give people positive, or negative karma depending on your opinion of them as a roleplayer. So a prospective gm, or fellow roleplayer can look at their profile and see that they have a large amount of good, or bad karma stacked up. Alternatively a way to at least block/black list people from forums you post due to the performances in other roleplays.