Don't want to poop on the party but I did dump in Dec. :X (Read end of post)
I already feel bad about taking that profit.
 
To OP: To be honest nobody could have known when to dump because it looked like it could easily go to several hundred thousand. And psychology had us all with everyone saying "To the moon!" when we already reached the top, so we all waited for more. Except for some lucky people who got out at that point.
 
To make you feel better: I dumped my major holdings (not disclosing how much) already at around $2-3k just because one person wrote something.. Could have easily made a really stupid amount of money with those BTC I held for so long. But I didn't, only made some "small stupid amount of money" lol. That was stupid. Bought them way below $1000 But I still had X BTC left which I held because I did not care anymore until I was recommended to sell by a close person. After a long discussion I then sold.
 
Yes I am not a smart person but who cares. Took profit for Bitcoins which I bought way below for what I sold so I still made some money. Not the smart way to make money (relying on other people lol) but it somehow got the job done.
 
Just take care for your next investment. Maybe only invest what you can afford to risk. Because investing is risky as hell, it can turn out nice or you can lose a huge percentage of the original investment amount you put in, especially with these markets. Stressy as fuck, always making people sell bottoms.