Oh forget it.

忘记吧想也没用。

youdao

Oh, forget it! Don't say any more about it. It's time for a break [rest].

算了， 别说了， 该休息了。

《新英汉大辞典》

I have some people that say I am not doing this well, oh, forget it. No, keep going.

有些人说我这样做不好，哦，忘了吧，不，继续。

youdao

I have some people that say I am not doing this well, oh, forget it. No, keep going.

有些人说我这样做不好，哦，忘了吧，不，继续。

麻省理工公开课 - 固态化学导论课程节选