There is an important field in coinmarketcap "bitcoin dominance" most people really look at it. Last year when bitcoin was rising to its peak,,its dominance was over 50%. The implication? Bitcoin was gaining value against most altcoins except some few.
During that period lots of altcoins value went down to almost zero, even some top 20 altcoin lost ground. Some are languishing in the lower half of coinmarketcap.
But as time went on in early 2018 the tide changed a bit, Bitcoin dominance went to as low as 36%. Bitcoin dominance have started growing again.
From all indication, it could hit above 50%, even 60%. This time around a lot more altcoins will loose most of their values to near zero, once Bitcoin ETF is approved bringing an explosive influx of institutional investors who will focus more on Bitcoin and avoid a larger part of altcoins even some in the top 10.
You have two choices to make;
1. Hold more of Bitcoin right now, and a few altcoins that have values that institutional investors can not ignore. It's a Herculean task to find these few coins, because even coins in the top ten will not be spared.
2. Hold Bitcoin alone until the coast become clear in a later date. There is this FOMO of seeing some coins going up and jumping into it. If you don't know how to play the game, don't get in.
This is my opinion. What do you think guys?
I will hoard lots of bitcoin and will sell some of my altcoins