Character Motivations

So your protagonist wants something. That's pretty obvious. Why they want should be obvious too. But why they want it is a whole nother story. 
First off, you'll need a decent motivation. If your MC becomes a vigilante and starts killing people, it can't be because someone filed his taxes wrong. We'll see this character as a complete jerk. But if he becomes a vigilante because his parents were shot in an alleyway when he was eight years old and he was raised by his butler and consumed with revenge for decades, we're going to identify with him better, because while a notice from the IRS might be annoying, the death of your parents is something that can ruin your whole life. We've all lost someone. We can connect. We can feel his pain.
Second, you'll need to make this motivation clear to the reader. Show us how deeply your character needs to achieve his goal. Show us how much he fears the idea of failure. Show us his motivation, show us why he needs what he needs and wants what he wants. Even if he wants to become a professional noodle maker, we can still take him seriously if he has a clear and deep motivation.
And don't be afraid to let his motivation change. Say your character is a microbiologist. He's motivated by the money associated with the job. Then his daughter is diagnosed with cancer. Now his motivation has changed. He still works as a microbiologist, but now he's motivated by fear for his daughter's life. 
Comment below what your character's motivation is, and tell me if this advice has been helpful.