Have you ever used an app that takes audio and converts it to written text?
What if you 'dictated' the report to yourself using your phone to record your responses one narrative section at a time and then type out the responses?
Can you do a simple audio report with fluid word choice, clear concise facts, and descriptors in a simple narrative style and then type out the report?
If you heard your voice speaking with proper grammar, would that help you get more grammatically correct words down on paper, making Grammarly more effective at correcting your writing style?
Your written voice seems uncertain and I detect real struggles with the whole writing process beyond not being a good writer or remembering rules of grammar.
I have a family of non-neurotypical types. With variants in audio and visual processing, focus, integration of tasks, I would have to wonder if you had some marginal learning disability that went unnoticed, depending on your age, because so much more is understood now about cognition, learning styles, and neurodevelopment.
Are you a strong auditory and/or kinesthetic learner? How are your verbal skills, gross and/or fine motor skills (not necessarily with pen or pencil, think woodworker, painting, sewing, etc.)?
Most people think of their strengths along classic lines of visual, auditory or kinesthetic learning, but I think in Australia in recent decades they also came up with one more element, VARK, to address that reading and writing piece as an integrated component of understanding learning styles, strengths, and weaknesses.
My kids are older, but one of my middles child's classmates was not diagnosed with dyslexia until she was in fourth grade, after her third-grade teacher recognized that something was definitely off. Other things came up in a neuropsychological evaluation that only a highly trained specialist would ever notice or could explain. They are now freshmen in high school. I have known that family for nearly ten years. She always struggled compared to her fraternal twin sister since kindergarten. Even today, in a good district, good resources, the differences took some time to recognize as that atypical beyond needing more supports.
I have a house full of sensory processing challenged and bright (the oldest had As when he was in eighth grade math without doing homework all year) but atypical learners and am hyper-analytical in thinking about the possibilities.
Even really bright people can have exceptional challenges with things that others find so simple. You are not alone.
Think about your strengths and how to find resources to maximize your strengths and support your weaknesses.
Do not get discouraged.