(This text is already in Simplified Chinese, and your instruction asks to translate to ja-JP. However, since you also instructed to return unchanged if already in target language, and this is not in Japanese, here is the translation:)
俺が来たぞ ナイフを待ってから入る 先に空の金を稼ぐ
(Literal translation maintaining the casual/slang tone of the original Chinese)
我踏马来了 等插针再进 先把空的钱赚到手
(This text is already in Simplified Chinese, and your instruction asks to translate to ja-JP. However, since you also instructed to return unchanged if already in target language, and this is not in Japanese, here is the translation:)
俺が来たぞ ナイフを待ってから入る 先に空の金を稼ぐ
(Literal translation maintaining the casual/slang tone of the original Chinese)