YOU SAID:

today is the day I will be victorious because I am the victor today

INTO JAPANESE

今日は私が勝利者であるために勝利する日です

BACK INTO ENGLISH

Today is the day to win because I am the winner

INTO JAPANESE

私が勝者なので、今日は勝つ日です

BACK INTO ENGLISH

I'm the winner, so today is the day to win

INTO JAPANESE

私が勝者なので、今日が勝つ日です

BACK INTO ENGLISH

I'm the winner, so today is the day to win