Daily Chinese Idiom Guessing Game
Refers to a person who used to be talented but has exhausted their creativity or ability.
江郎指南朝江淹。原指江淹少有文名，晚年诗文无佳句。比喻才情减退。
《南史·江淹传》淹乃探怀中得五色笔一以授之。尔后为诗绝无美句，时人谓之才尽。”
After his first successful novel, he never wrote anything good again; he was like Jiang Lang with his talent used up.