Often times I read various posts of people/traders/investors preaching HODLing some altcoins for years and so on thus I took some to research on altcoins 3years and guess what? Most of the altcoins in 2016 are no more to found anymore. You can take a deep look as well via
https://coinmarketcap.com/historical/20160103/My candid advise is to trade with the five senses intact and not with emotions. Don't get on some shitcoins with the intention to hold for years else you might get rekt.
That would be the worst advice ever, holding altcoins right now is the worst thing that can ever happen to any investor, when it comes to altcoins, the best thing to use them for is short term trade, it is a trade that you can get in and get out quick.
Altcoin are not much reliable for now to stay with them for the future, the moment that we see an increase in them, that is the point where we have to quickly remove them and look for bitcoin to invest in and i think that is actually what many people are doing right now, and this is the reason why bitcoin is gaining dominance for a while now, people are just tired of holding on altcoins, most especially their bull run, and bitcoin being the only performing coin, they are investing in it.