There is no shortcut to improve writing style, only by reading, writing and practicing more. When you have enough food in your stomach, you can write well. On the basis of writing good things, you can add your own personal style and characteristics.

That's what I did when I wrote my thesis in college. I didn't read many books at that time, so I really couldn't hold back a few words for a long time. Later, I did a little research, checked the information, and revised it repeatedly, which was tireless revision again and again. You can't change it any more. It's almost the same.