stay hungry
To remain determined, competitive, motivated, and active in one's hopes, ambitions, or goals; to keep oneself from becoming complacent or self-satisfied with less than one might potentially achieve. You've got a lot of skill, kid, and you're one of the best fighters in the city—but you've got to stay hungry and never lose sight of the biggest prizes out there! It was hard staying hungry after finding such success with my first novel. I just found I wasn't as driven to write when I'd already garnered so much praise and recognition.