Motivation can be such a personal experience, or one that all can be moved by. I have quotes, songs, images, people, and activities that can get me going. At times I go into whatever it is I'm doing already motivated, or it strikes me when I'm beginning to fail. Many times I still fail, but I gave it my best, and that is a victory right there...especially when everyone sees or hears it. The fact that I tried it and then knowing what I need to focus on to better myself continues my life journey.
All that being said, remember to first believe in yourself. It may not happen immediately, but keep working at it and those mountains will become mole hills.
Top pic is from HAMILTON. The bottom one is from THE COLOR PURPLE. Both outstanding musicals.