I understand your question. Judging from your fluency and logic, what you said is true. I am just the opposite of you. I'm afraid of argumentative writing.

I can't suggest a method, just say some ideas.

1, you didn't do anything wrong. Don't completely doubt yourself because of a bad exam result. Just be good at thinking. However, in our future practical application, we need to describe events or things to others, and this purpose even exceeds reasoning. Therefore, what you need is not to correct mistakes, but to make up for shortcomings. Don't lose heart. Tell a joke, and when you get into high school, focus on argumentative writing, and you won't worry.

As for the narrative, you should think about how to make it clear to an unsuspecting person according to the requirements of the topic. If you feel that you have nothing to write, think about what others need to know from you as the narrator of this topic. As for the level of words and sentences, you think it is no longer a problem.

In fact, your narrative is not bad. Don't I know what you want to say from your question?

Don't lose heart, keep trying.