Also, try and do something on this project you really want to do! don't wait for the right opportunity to design motion graphics you love! you won't be given the opportunity until you show what you got!
It's hard to tell you that how you stay motivated. Most of the people follow their own way. In my case, i will always try to follow some famous designer work that i like most. Also try to engage my local community mate and always avid to learning some thing new about designing. At the end of the day your confident helps you to stay motivated.