How could rewriting a story in the first-person point of view change the perspective and theme of a story that was originally written in the third-person point of view?

Rewriting the story to first-person would change the perspective of the story. Originally it was third person, so you generally know about most characters from a narrator point of view. However in first person, it focuses on only one character's thoughts and feelings and the reasons for their decisions.

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53. just