Bitcoin prices have a huge effect on altcoin. the effect is quite large. the decline of bitcoin can make the altcoin very drop in price. even though at that time they actually had no problems with the project but because the effects of bitcoin made a price drop
You're right, I myself see that the decline in bitcoin prices that have occurred since the beginning of 2018 until now, has made the altcoin price fall more than 100%, or almost like that. well, but that might be a natural thing, considering that bitcoin is at the heart of cryptocurrency.