If you made a decision stick to it. You can't predict the future. If it goes to $1k you'll be upset. If it crashes to $1, $10, $50, $100, you'll be upset you didn't get out when you felt you should. So just accept it and what will be will be.
That. It's easy to look back at a chart and wish you'd made a different decision. As they say, a bird in the hand... It's why I'm running a trailing stop, assuring me a sizeable return. If it drops more, I may buy back in, but my principal is not at stake.