The recent drop is the result of a technical pattern breakdown of the Bitcoin chart. I have seen traders predicting supports that Bitcoin could penetrate at $46,000, $42k and $38k respectively. Most of the above milestones have been passed. We are expecting Bitcoin to break through the $38k mark, if not, the next support will be at $35k and $32k.
Every time Bitcoin decreases in value, other cryptocurrencies will also decrease in value. That has become the norm in the cryptocurrency market.
There is no technical pattern that can predict the direction of bitcoin.
People invest in bitcoin to make profit and Bitcoin grows based on news, if the news is good then bitcoin will go up in price and it will drop when there is bad news.