i decide to sell my altcoins. when i noticed that i have a good and high profit to me. when i realized that the value of my altcoins doesnt rise high more. and lastly i decide to sell my altcoins when i really needed money. even if it low or high when i need it then i sell it.
yeah when you need cash you better sell it. actualy in cryptocurrency you can earn good profit not only buying but also selling in some point.