You are looking at things all backwards. I sell some and look for something else undervalued. When you regret selling, you hold losers.
This stock doesn't have any EARNINGS....and isn't projected to for years.
I can't worry about money left on the table in every stock or investment.
I can see you aren't going to grasp it, but just a quick example from a personal experience...
I was buying a new house and selling my old one. The housing market had already heated up somewhat and my realtor was telling me to hold out for a bit more. Instead, I sold it through Open Door (no, this isn't a commercial for Open Door). They paid me cash and told me not to repair anything. I took the money, put it into 5 different tech stocks and made enough in 4 months to pay cash for the new house. Yes, I didn't make as much on the house sale, but I made far more elsewhere.
Investing isn't a game to me, this is how I make my living.
Don't fall in love with your stocks, they aren't your children. If this goes higher, I still have 4000 shares with no cost basis.
Now, I'm done trying to teach investing to you. It's exhausting and better time spent elsewhere.