When do you take the money?

Bought in roughly $20k of PLTR at ~$36 per share many years ago. Held all the way down and back up, telling myself it will be my expensive mistake to learn from as the value hit single digits but still believing in the company.

Now with it up almost 120%, at what point do I take the gains and run? At this point it’s a good sized portion of my entire brokerage account and while I still have faith, that’s a lot of gains to be greedy on.

Any and all insight appreciated.