YOU SAID:

Try hard to be better

INTO JAPANESE

良くなるように頑張りなさい

BACK INTO ENGLISH

Do your best to get better

INTO JAPANESE

良くなるために最善を尽くします

BACK INTO ENGLISH

I will do my best to get better

INTO JAPANESE

私は良くなるために最善を尽くします

BACK INTO ENGLISH

I will do my best to get better