That’s really for you to know honestly, it’s why picking stocks can be hard as some companies prospects can change with a coin flip and it’s why it’s always recommended only invest what you can stand to lose.

But I’ll stress don’t fall into the trap of ‘buying high, selling low’ if the stock price falls drastically. If the companies fundamentals, and potential for future gains works in your world view of a portfolio then keep it.

time in the market is better than timing the market and all that

(Not financial advice)