that event occurred when many people would follow the hype or rally carried out by bitcoin. Altcoin momentum will be created when bitcoin's dominance in the market begins to stabilize and the price will not experience rapid changes. moments like that altcoin momentum can get a pump.
we have seen a lot of bitcoin pump events on the market. and it happened that some brought altcoins in the pump and some left them at the bottom. this is tied to the dominance of trading in the market.
Based on my observation bitcoins dominance made a huge gap to altcoin when this pandemic happens but if we were looking back to the time where cryptocurrency was still new bitcoin already leads the cryptomarket. But the good thing about the huge investors appreciation to bitcoin was altcoins also been appreciated but the impact of appreciation of altcoin was not like as what on the bitcoin. We haven't experience yet the year of altcoins but this year I guess was a good year for cryptocurrencies.