I've always been one who sells to earlier, either to minimize my losses or to realize my earnings ASAP and leave. I've seen in most of my investments, if not all that if I would've just left the coins there they would've been worth 10-50x what I put in before. This is upsetting as a person and trader, as I see how much money I'm missing out on.
Well, I can't blame you if you are a little bit tense and easily influenced by a sudden drop of coin's price in the market because that's a common scenario here in crypto world. We can't do anything about that unless you learned how to handle your emotional well being and be brave.
Since you already concluded that you missed so much amount of money after selling your coins very early, why don't you use that fact to force yourself to practice holding longer. I'm sure you'll earn bigger and feel more satisfied after achieving it.
Indeed, just learn how to hold but if you still cannot do nothing then try to earn through this forum. In my case since bitcoin has now cheap price I could not make transaction so in order to earn withouht selling any bitcoins I participate in bounty campaigns to have income.