No Altcoin should be kept in long-term wallets. We have seen the clearest examples of this in the past. People invest their money in the coins they trust very much, and they can't even get half of that money after years. You have to be careful.
holding coins for a very long term is indeed very risky, because we also cannot predict what the future will be like,
it is better to hold for 1 year or several months, because according to technical analysis it can be predicted,
and make sure we can take that risk, for Ziliqa I think it's a very good altcoin, so for now there is no need to worry,
but if you want to invest make sure to buy it at a low price.