Just do you man and post naturally however you want to..
The chances of getting into CM are ridiculously slim for anyone, and trying to "improve" yourself to fit whatever they are looking for will/would probably have little effect..

You can keep applying though because maybe they will want what you are in the future.. It's nothing bad about you, they are just extremely picky, and they can afford to be picky due to the extreme supply/demand imbalance in paid signatures..