Your language indicates──and limits──what you think.
Remember yourself. Deep inside, you have an observer, a constant neutral witness to your posture, gesture, facial expression, breathing, taste, impressions of light and sound. Don't leap to interpret. Just be there and observe.
To write better you must develop your taste for truth. You have to pay more attention to what you really think, feel, see and want.
Start writing by thinking, not wrestling with words.
If you'd blush saying something in person, don't write it.