How did you find/develop your "niche" skill(s) within a workplace?

Following a recent promotion, I've been told that I need to be focusing on training and delegation, which has led me down the thought process of losing my 'uniqueness' in the team. I was previously a teacher before this job, so I have no issue with training and understand why it needs to happen, but I now quite selfishly can't shake the feeling that 'if everyone will be able to do what I can do, then what will separate me …

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