If Altcoin could show growth even in a bear market, then it seems to me that it is better to leave it, because when the bull goes on the market, he will be able to bring much more profit!
Not always this is the case , each coin has cycles of growth and fall and you need to correctly identify them , not the fact that the growth now it will grow and bullish , but of course it is better to store them in such a market and wait for the bullish, just be sure to deversify the risks !