Bitcoin prices dropped to make the altcoin price to be very low and even 500% lower than the price of ico, which makes many investors experience a lot of losses. not a few investors who become poor because of it. is it true that bitcoin affects the price of all altcoins

Well, If you buy at the top then it will surely make you poor when you start selling it in the current market. I guess you are not yet lost until you sell it on exchanges and receive less profit out of it. Be sure to wait for the bull market to come ahead.