もっと注意して

be more careful

→ もっと
phrase Uncommon #19,138
be more careful Used to tell someone to pay more attention or act with greater caution. The form 注意して modifies a following verb, but it can also stand alone as an instruction.
JA: 道を渡るときは、もっと注意して。
EN: Be more careful when crossing the street.

次はもっと注意してやってください

Please be more careful next time.

もっと注意して仕事をしなさい

You need to be more careful with your work.

その問題はもっと注意して調べなさい

Examine that issue more carefully.

それはもっと注意してやらなければいけない

You need to be more careful with that.