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.
It is your desire and also your trust on the coins you are holding.
Example if you are Holding Ethereum or Binance .
Do you think that you can just easily go out from holding when you know year after year the value is increasing ?
https://coinmarketcap.com/Look at the market mate, those altcoins are makin great and now to be held for long term is the best solution to make money .
Never let go of best coin if you can afford holding.