English isn't my native language. I make mistakes when I write. Luckily there is free help a URL away. The service is called Hemingway App.
Give Hemingway a text and it will return a readability grade. It will also colour parts of your text where there are issues, explaining why there might be a problem.
You can use Hemingway as an online text editor. Write your texts and have them graded while you type.
Unless you write perfect English I recommend that you give your next text to Hemingway and see what happens.