Constantly making it to the final stage of interviews than being rejected.

Title says it all, I'm a graduate, working part time right now till I find something full time. For the past month I keep having multiple interviews with a company, making it into the final stage then just given the 'unfortunately it was a close call' or 'We just found somebody better'

This isn't a whine post, I want to constantly improve myself and I do value the experience I am gaining. However is there any advice anybody could give just for that extra cherry on top that would push me over the edge in these interviews?

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