You do a really nice job of describing this early 'failure', which actually was a learning experience for you. The piece could have been richer if you had described one of you disastrous incidents in detail. For example, in this paragraph:

It was on the second day of the day that the accident for which I was fired occurred: a small mistake, an almost imperceptible, but catastrophic slip. I misunderstood an order. And when I realized what I had done, I froze, I saw the world around me vanish.

You could have told us exactly what that catastrophic slip was. This would have really enlivened the narrative.

Sometimes, when I'm writing a story, I look it over and try to find opportunities like this. I go back and think about the details, about exactly what happened. What did the people say? How did they look? Was there a mess on the floor? Did the customer yell?

Do you see how rounding out this incident would have drawn us into your experience and would have made your piece more memorable?

You have a effective writing style. I look forward to reading more of your stories, whether fiction or creative nonfiction.