There are several FREE resources that will help you to write clearly and concisely, so choose the one that resonates with you.
Anything by Bryan Garner (editor of Black's Law Dictionary and considered to be an authority on legal writing).
Grammarly - This free online tool gives writing suggestions and checks your work as you go along.
Plain English for Lawyers - The National Jurist featured Plain English for Lawyers in its August 2021 list of "Three Books to Read During Law School." Free download!
Purdue OWL - This free online writing lab has lots of helpful instructional material.