I recently read Disrupting the Game by Reggie Fils-Aimé. It's a very quick light-read. By biggest take-away was to always ask yourself "so what?" when you are writing.
Why are you writing this piece, what action needs to be taken?
Asking "So what?" has helped my copywriting, my tweets, and my internal Slack messages.
A button is broken on our website. So what? -> A button is broken on our website, we are no longer receiving sign-ups. We need to fix and push the change to production immediately.
Take frequent breaks. So what? -> Taking frequent breaks helps maintain focus for longer and is good for your eye sight.
Improve your writing. So what? -> Improving your writing helps convey the meaning of your idea and WHY someone should heed your advice.
Take care,