To build your writing momentum there are several things that I’ve found that helps me.

First is to not stop writing. Remember the theory that an object in motion tends to stay in motion and an object at rest tends to stay at rest. It’s harder to write when you have to start all over again after a layoff or time away from it. If you keep going you’ll be able to get more and more done.

Another thing that I found helps is to try and increase my word count by 20% from the day, week or month before.

That’s the things that have helped me. Hopefully they help you too,