I was just looking at the coinmarketcap table since 2013, I was surprised in what I saw, many coins topping the charts then are now almost non-existent, we need to be careful of the kind of coins we hodl especially for long term. Most of these projects just die after the initial hype.
No need to store all altcoins for a long time. Sell them as soon as the price rises and you have the opportunity to earn. You can also sell and fix losses if the price is constantly falling and there are no prospects for growth.
Only altcoins from the top 20 list can be stored for a long time.