For me my own greatest regret was selling my coins been giving to me for participating in bounty at ico price but now the coin have little moon to $5 deal feel like crying now.
That's gonna be a problem if you cannot let go of it.
Although it's just a bounty, it has the same value as investors coin, we sell because we need to cash out but the best way to do it is to sell a portion
and just hold a portion also for your future.
Anyway, it's all gone now, just learn from it, there will be more coins to be earn.
That's right, you need to learn how to let go of these situations. We all want to earn as much as possible, so we take part in the bounty and that is why we sell when we sell, if we always knew when the price would rise or the crypto market would fall, there would be no crypto market.