1. Build the input tree
A North Star is moved by a small set of input metrics, not by willpower. Name them: the three or four levers that, if they move, move the star. Teams act on inputs they can influence this week, not on a lagging headline they can only watch.
2. Add guardrails
For every North Star, name the metrics that must not get worse while you chase it. A support team can lift "weekly active users" by spamming notifications, right up until retention and satisfaction collapse. Guardrails are what stop a win on paper being a loss in reality.
3. Make it customer value, not revenue
Revenue is the result of delivering value, not the value itself. A North Star built on customer behaviour, the action that means someone got what they came for, leads revenue. One built on revenue lags it and tempts short-term extraction.