Once chosen, aim to complete these 3 tasks for this day. Some tasks may take longer. The idea is that these 3 things are the main things restricting you from getting other things done. Once completed, a feeling of accomplishment and freedom will be felt. Brainstorming is a way to see what is really on your mind.
Some people brainstorm before the day starts, others at night.
Find a quiet time for yourself. Even the toilet can be a good place for this one. A self evaluation article to improve freedom of productivity and thinking. Learn to Brainstorm effectively. What thought waves really tell you.