Another name for self-motivation is optimism which is necessary if you want to make big in this world. It is a willingness to do something to achieve something valuable.
High-level of motivation is the key to success. You need to set your own personal agenda, which will keep you going. The question then arises what kind of motivation is needed, which totally depend on the person. You will have to find your motivator which will be your ultimate motivational aspect, i.e., for which you will work further.