What's the idiom for having fun by yourself?

Pinyin: zü dé qí lè

Explanation: I can have fun from it.

Origin: Ming Tao Zongyi's Record of Dropping Out of Farming, Volume 2: "bai ling finches were born in the desert land of Wuhuan, and they sang harmoniously and enjoyed themselves."

example: the old man has a wife and a buddy, so he is alive, but it is also ~. ★ Zhu Ziqing's Collection of Miscellaneous Essays and Miscellaneous Notes of Mengzi

Synonyms: carefree, carefree and leisurely

antonyms: asking for trouble, suffering from it, worrying about the sky and caring for people

Two-part allegorical saying: make a bed and listen to the radio; Playing the piano under the betel nut tree

Grammar: as predicate, attribute and adverbial; Refers to people who can be at leisure.