well, when i have benefited from the coins i have, i will sell them. and of course when the price has exceeded 30%, I will sell it. well, so much risk we have when we hold the coins for so long.
Holding altcoins longer is very risky as price can crash at any point of time so when you are in good position of making profits you should sell your coins without waiting longer as if you don't sell it at a right time then you are missing an opportunity of making profits and may be you will never see that price again or you need to hold your coins longer till it exceeds your entry price and that can be really time consuming.