My 11 yo is in a similar state. I've come to the conclusion he needs to read more. It doesn't need to be a high level, just more.

However, we've also used Reading Detective, a series from the Building Thinking Skills company which has helped him with standardized testing which our state requires. Finally, I am also using the Writing With Ease workbooks from Peace Hill Press and focusing on narration in particular with them, but really, narration of anything would work.