I agree, 3 years is quite a long time to hold a new altcoins that we think will rise in the future, an even a good potential altcoins wont take that long, if the coin that you are holding longer than a year and still without any good progress, then sell them all, it would be better if we know to cut our losses and stop wasting time to invest in some better altcoins, the time is very valuable so we can use our money to invest in new altcoins when they have higher chance to rise in the future.