百尺竿头，更进一步

bǎi chǐ gān tóu , gèng jìn yī bùbaichigantou,gengjinyibu

1. lit. after climbing a hundred feet up a pole, one should go even further (idiom)
2. fig. even if one has achieved a measure of success, one should strive to do even better

Study it in Yanamino