Altcoins are really scary, if you can do some research you will see many good altcoins that had very good start and value in 2018 and are still alive today but we never heard anything good from them anymore for some reasons, they are now like ghosts, honestly altcoin investment is more scary, this is why its better to always take profit, most especially from new altcoins, Profit is Profit, either big or small.
Taking profit is always good, i have seen projects that peaked right after launch to multifold gains and then settled back around ico prices and even after many years they are still around that range. If someone trades crypto against fiat or stablecoin pairs then taking regular profits is something that is needed to stay profitable and liquid.