How to Maximize Words Per Hour

At first, you were writing 900 words an hour. You got up to 25, 25 hundred words per hour. How did you go from 900 to 25 hundred? The one thing that really helped me a lot was doing the pomadoro technique. That's when you sait a timer for 20 minutes, 25 minutes, and then just working and focusing on that for that short time, then taking a break.