There are no working spells for motivation.
If you drink a glass of water, and believe that someone had put a few drops of "luck potion" in it, do you believe that the potion worked, or is it just your own perspective?
You need to motivate yourself. You need to get your own energy pumped up. Make a motivational board, write personal notes to yourself, you know, stuff like that.
Magic can't fix everything, you're going to have to do that on your own :)