How do I get my curiosity back after becoming an expert?

You mastered your field, and somewhere along the way the mastery quietly cost you your curiosity. You know the answers now, so you stopped asking the questions — and the questions were where the aliveness lived. Expertise gave you competence and took your wonder in trade, and you can feel the difference. But certainty is often a kind of blindness. When you are sure you already know, you stop looking, and you start missing what is new, what has changed, what does not fit the pattern you mastered years ago. The most alive experts are not the ones with the most answers; they are the ones who stayed curious enough to keep finding the edges of what they know. So go looking for a question you cannot answer. Read outside your field, ask a beginner what they see, or take up something you are genuinely bad at. Put yourself back in the position of not knowing, on purpose. Curiosity is a muscle, and it returns with use. You do not have to unlearn your expertise. You just have to stop letting it convince you there is nothing left to wonder about.