You can't just be motivated, when you see flames you don't need to feel motivated to run away from it when it's burning your hand; you just have to be logical.
For you to not lose you have to keep doing it; that's motivation, that's the source of motivation
Your motivation should be the fact that YOU HAVE A SHITTY LIFE and you're in A BAD POSITION
To make it better, you NEED to do what you NEED TO DO and what you think will help you
These questions are really weird questions if you're life's shitty, the only way you can counteract it is by changing things and your source of motivation is your shitty life