I learned my lesson on Pan Am many decades ago.
It had dropped to $5 and I bought a bunch. Major US airline, and even this was foretold in the movies:
"Since there's a bottom to these things" I bought more around 2 1/2. In very short order it was trading well below $1, and at that point just holding on made sense, since there might be a "bottom" from which it could rebound. Turned out there was no bottom. Lesson learned.
NOT saying I expect Tesla stock to go to zero, only that one has to be careful making assumptions about future stock price.
You learned the wrong lesson then. Even IF Tesla goes bankrupt, you would be $20 / share ahead had you bought at $180 vs $200.