You stay positive and motivated by doing the following things, simultaneously:
Keep your mind on the goal.
Talk about how you can make your goals a reality.
Build detailed plans to describe how you will achieve your goal.
Stay away from those people who tend to drag you down, emotionally.
Limit your exposure to the 24-hour MSM, negative news industry.
Look after your physical body, so that you develop a high level of vitality and energy.
Make your physical environment conducive to positive feelings.
Hang around with other positive people.