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なれって

become ...!

→ 成る
phrase Uncommon #13,318
become ...! なれ is the command form of なる (to become). って informally marks it as something said or quoted, so the phrase can mean “(someone) said to become ...” or “I said, become ...!”
JA: もっと自分らしくなれって言われた。
EN: I was told to be more like myself.