Success exposes character because eventually you can afford to stop pretending.

Constraint hides a lot. When you cannot afford to be difficult, you are agreeable. When you need people, you are considerate. Take those pressures away and what remains is the actual disposition, which is why success so often looks like a personality change when really it is a revelation.

Watch what you do with small amounts of power now, since the pattern will only scale. How you treat people who cannot help you is the most reliable preview available. That is the thing to work on before the constraints lift.