How do you develop a complex, active fantasy protagonist whose inner drive shapes th

[OliverUW]

I'm working on a fantasy novel and I've hit a major block with my protagonist; she feels flat and reactive, and I'm struggling to give her a compelling internal conflict that drives the plot forward. I have the world-building and external events mapped out, but her personal journey feels tacked on. For other fiction writers, how do you develop complex, active characters whose desires and flaws organically create the story's tension? What exercises or questions do you ask to uncover a character's deeper motivations beyond the obvious plot goals, and how do you weave their internal arc seamlessly with the external action so one feeds the other?