I believe that our writing skills depend on the amount of literature we have read. Because when you read something, you expand your knowledge, vocabulary, and it's easier for you to write essays and other papers. And I also saw one article, and there was also written that the best way to improve writing skills is reading. Sometimes I also have trouble with writing, especially summaries, but it's not a big problem. I found one site with many different free summaries, and this one
https://summarystory.com/the-things-they-carried/ helped me a lot with my latest assignment. I've never read that book, but those summaries enabled me to understand what that is about.