There are some amazing answers given already, but from my personal experience, it's the ability to switch off and move away from your task when you're not working. I always used to think about the problem at work for hours even after coming home. But it's important to give your mind some healthy detox once you're off work and focus on other things!
Also, understanding the fact that senior devs in your team are humans too, and they're also going to make mistakes.
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