That sounds like a deeper issue. I am not a motivational expert, though I've had more experience than I'd like developing coping strategies for low motivation.
Consider that perhaps being motivated automatically isn't always the best thing. Auto-motivation can make it harder to choose a good and worthwhile direction, which motivates you on its own merits to something above self-interest.
Maybe you could afford to let your self-motivation lie fallow for a while, if that's what you need to do. Put your brain in a jar, and do something helpful and physical.
Maybe none of this applies to your situation? I do find it an interesting topic as well though.
Consider that perhaps being motivated automatically isn't always the best thing. Auto-motivation can make it harder to choose a good and worthwhile direction, which motivates you on its own merits to something above self-interest.
Maybe you could afford to let your self-motivation lie fallow for a while, if that's what you need to do. Put your brain in a jar, and do something helpful and physical.
Maybe none of this applies to your situation? I do find it an interesting topic as well though.