the psychological moment
The time at which someone or something is most able or likely to achieve success or desired result. The devastation of the country was the psychological moment for the dictator to seize power. The attack on the region created the psychological moment for the two rival nations to finally put aside their differences and join forces.
the ˌpsychological ˈmoment
the best time to do something in order for it to be successful: The publication of her first novel came at the psychological moment, and she became well known very quickly.