There are many old sayings in investing. One is you never want to be the last one in the door nor the last one out of the door. Its always better to be the first in and the first out. You might miss out on some gains but at least you get gains. This ties into the pigs/hogs saying.
I have zero regrets taking my profits again on NVDA during this last melt-up. I got out around $312 and am as happy as a pig in shit about it. I couldn't care less if it runs up to $400 before turning. My money is already in the bank.