My biggest regrets in cryptocurrency is when I trade my tokes as soon as I got them. I was a beginner that time I don't have that much knowledge in cryptoworld. I didn't the concept of HODL. I was greedy since it was my first time. 
that is like my experiences, i was too hasty to sell the tokens that i got from the bounty, apparently, not need too long time, the price was to the moon