Build on what others have said

Let yourself be inspired by your fellow players. Take elements that they introduce and use them yourself. Build on them, riff on them, tweak them.

Character creation is the most obvious time to build on what others have said. The Fox tells a tall tale about how she and her sister met a creepy old man in the woods? On your turn, re-use one of those elements! If you're the Ranger, maybe what you're worried about is that same creepy old man, spotted near the Ruined Tower. If you're the Would-be Hero, maybe the Fox's sister is the NPC whose heart you hope to win.

During play, when the GM asks questions, continue to build on each other's answers. Let your own ideas grow from what's already established. Don't make up something new when you can reuse and reincorporate. Engage with the fictional world, even as you create it!