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.
New technologies always come and old go , I think you should not keep many coins in them because there is always the risk that the coin will disappear and will cease to develop.