Bitcoin is the standard by which every other cryptocurrency is measured, and that means all altcoins are hedged in one way or the other along Bitcoin’s success. However, in the wake of the early surge in Bitcoins, a majority of the gains obtained in cryptocurrency trading can also be attributed to altcoins like Ripple, Verge, Qtum, Cardano, Tron etc.
This makes enthusiastic investors begin diverting funds from Bitcoin, thus destabilizing the Bitcoin market.
The fall of cryptocurrency prices could also be attributed to other factors such as:
The confusion on Coinbase between Bitcoin and Bitcoin Cash;
Regulation and hacking;
Regulatory pressure and rumored forks which have surfaced on some fronts;
Energy usage;
Perception of the public.