Refraining from holding negative thoughts in your life, is as powerful as removing negative people in your life. To keep from going back to the habit of holding negative thoughts you need something to replace it with. Preferably something positive. At a workshop, I coordinated over the weekend, one of the attendants shared a great tip. She has a quick list of positive phrases to use to replace negative ones, which she adapted from this Feel the Fear and Do it Anyway by Susan Jeffers [affiliate link].
For her sake and ours, I made a quick graphic out of it.