When should long-held alt coins be sold? When to sell even when we are in profit? That doesn't make sense. Let me know if there is a suitable alternative to this issue.
If you ask when is the right time to sell old coins, this is a question that really doesn't need to be answered, because everyone can clearly know when is the right time to sell the coins we have. But since you've asked this on the forum, then I'm obligated to answer it.
First, the right time to sell the coins you have is when the market conditions are good.
Second, when the coin price increases significantly from the previous purchase price.
Third, you can do all this after analyzing the coin and the current market conditions.
If you get this opportunity, then it's a good time to sell the coins you have.