YOU SAID:

I will be a little more careful next time.

INTO JAPANESE

私は次回より少しもっと慎重になるでしょう。

BACK INTO ENGLISH

I will be a bit more cautious than next time.

INTO JAPANESE

私は次回より少し慎重になるだろう。

BACK INTO ENGLISH

I will be a bit more cautious than next time.