Everybody already _is_ the main character of their story by default. For most people work is just one plot line, likely not even the most important one.
A good manager realizes this and accepts that the only choice they have here is to choose their role in everyone else’s stories. Being the main protagonist of other people’s stories is just not possible and trying to be one makes one a horrible manager.
A better manager understands that everyone’s experience is different, and the role you play in others’ stories isn’t entirely your choice. Just getting to the bottom of that takes effort in itself.
A good manager realizes this and accepts that the only choice they have here is to choose their role in everyone else’s stories. Being the main protagonist of other people’s stories is just not possible and trying to be one makes one a horrible manager.