The worst job you ever had taught you exactly what you won’t settle for. Tuition paid.

Bad jobs teach a specific thing that good ones cannot. You learn where your limits actually sit, what a badly run place feels like from the inside, and how quickly a person can be treated as replaceable, and none of that is available from a job description. It was unpleasant, and it was also information you will use for decades.

Write down what you learned while it is still vivid. The behavior you will not accept from a manager, the conditions that wrecked your week, the part you were surprised to be good at. That list makes you much harder to talk into the same thing twice.