Nobody is born low agency. Babies are the highest-agency creatures alive, they will absolutely try to eat a battery, they have no concept of "I can't."
Low agency is learned, usually from being punished for trying.
High-agency people genuinely believe that reality is negotiable in a "there are always more levers to pull" way. It's about having this bone-deep conviction that if you keep poking at something from different angles, eventually something will give.