Trying to be optimistic, you a lesson and you paid for that not so much. Anyway, the bigger mistake would be investing in Bitcoin in 2017

No, it was not a mistake for me, only we are been trick by whales and fall into their trap...that is in the wrong timing.
We can consider those days a failure but not a mistake that we ever regret. The big mistake there I saw is that we are drag into a more optimistic person that we don't think for a drop to follow after the bullish is done. We don't think that will happen because in our mindset is to gain more and more, double our investment or even triple. And so much that we lose a lot. We all learn that day and that we become more on FOMO in every time we saw declines.