Thirty years to drink East Thirty. What does it mean to drink western food in the New Year?

"Thirty years east of the river, thirty years west of the river" is a folk proverb. Its source is that the Yellow River was not fixed in the past, and it often changed its course (this happened countless times in history). There used to be a place on the east side of the river, but a few years later, due to the diversion of the Yellow River, this place will become the west side of the river. This sentence is a metaphor for the ups and downs of personnel, which are changeable and sometimes unpredictable. Some people also say: thirty years east of the river, forty years west of the river.