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.
I do agree, there are some who actually continue to hold for years. They continue to hold waiting for its price to increase. Even if it is already increased the value they keep on holding, expecting a higher profit out of their investment. Instead of taking the profit and buy again once its price starts to decrease, they just continue to hold without taking any profit.