The more often you get yourself into the vibration of feeling good in your life, the more you get yourself into alignment with Source. This Source is the part of you that can see the bigger picture, the main theme of your life. Releasing resistance allows your Higher Self to better guide you.
By writing in your journal, you train yourself to move to a higher frequency. Since like attracts like, the more often you are in this higher frequency, the more you will draw to you things matching that frequency. Optimally, a single entry before you go to bed is a good way to get yourself into the habit of raising your vibration to attract the people, things and situations that you desire.