百尺竿头，更进一步
Break one's own record.

eg：You have to make further efforts to do a better job.

中英俚语俗语来源：传灯录：“百尺竿头须进步，十方世界是全身。”

同义词：精益求精 Though good is good，yet better is better.
反义词：固步自封 Rest on one's laurels.