I did have that problem.
I forced my awesome character into a story. I drew up this forced plot outline. And I wrote the story. But it wasn’t great. But what it did was help me build the true story.
My character’s story no longer even resembles that first one.
I always have a problem with making a story, I can create vivid characters and awesome worlds. But no story. I just had to force it. I think writing any story even if it’s not their story will help you find the character, and the story they want to tell.
Find a writing prompt that looks fun, twist it to your needs plot out the fine points. Not the details. X happens, that leads to Y and then we need A, B and C to happen and finally Z.
You should learn something, rinse and repeat.