YOU SAID:

My productivity isn't at its best lately

INTO JAPANESE

最近私の生産性がその最高の状態ではないです。

BACK INTO ENGLISH

Is not recently my productivity at its best condition.

INTO JAPANESE

最近、その最高の状態で私の生産性はありません。

BACK INTO ENGLISH

Recently, my productivity is at its best.

INTO JAPANESE

最近では、私の生産性は、その最高の状態でです。

BACK INTO ENGLISH

Recently, my productivity is at its best.