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 
Lol if you invest in Bitcoin at middle of 2017 who says that is the bigger mistake?the price climb up to 20k so if you Bought at 10k in 3rd quarter surely in 4th quarter you already earn double before December ends.
And Bitcoin never been a bad investment it only depends on our capacity how to maintain and manage our investing.
the more we eager to earn is the more we are being panicked.so stop expecting fast instead learn to wait and patient.