后路 The road behind. A line of retreat, and also room to maneuver. The Handian dictionary gives the example: “He is a careful person and leaves himself a road behind in everything.”
骑驴找马 To ride the donkey while looking for a horse. To stay in an unsatisfactory job, or relationship, while actively looking for a better one.
东方不亮西方亮 If the east is not bright, the west is bright. If something does not work in one place, it may work in another.