Why Is btc declining rapidly ?

Because so many people rushed to the crypto in the late 2017's after john macafee hyped verge (xvg) Raising the value to several folds more than it was originally worth.

Once people began to realize how overvalued it was, people started selling it off and hop on to other crypto alternatives (remember, they're hooked now)
And once time went on. we didn't see any new businesses accepting crypto (btc) due to its volatility.

I was among the fortunate who were mining crypto. i got in to mining RAVEN (RVN) coins within the first month of it being released.
after dubtracting the costs of hardware power usage, and estiamting a rough 15% devalue after its use i still ended up with 200$ in pluss from selling
the rvn. But i am getting off point so here's the

TL;DR

btc got hyped, ppl wanted
Hype stopped, ppl started losing money
ppl started to flee the market, hence the decline.
You can bet your butt someone made a stinking profit off from this (John macaffee COUGH)