I think you are not just the only one in a few that experience the same thing, I sold somewhere at $17k and I also have deep regrets about that action, though I bought something important for myself with that. Over time, I am computing how much I should have right now if I hold longer. But when I ask my friends about my experience, I figured out that I am not the only one and they advised that I should not take it too deep as when the time I sold, I also gained profits. They said that profit is already a profit no matter how big it is, we should be thankful for the gains that we have compared to those who will buy at the ATH then the price will just decline drastically. We just need to be patient enough to wait a little longer until the correction happens and then accumulate as much as we can and learn from the lessons from the past.