You can be ambitious about having enough.

Enough can sound like an answer given by someone who has stopped trying. In practice, defining it may require more courage than leaving the target open. An undefined target never asks you to decline an opportunity because the life you wanted is already taking shape.

Describe enough in terms you could recognize: security, time with particular people, work you respect. Those conditions may change. For now, they can give ambition a destination and let you notice when another achievement would cost something you value more.

What would let you recognize enough if you reached it?