hello friend,
in 2017 I was very happy when I saw the price of Bitcoin increase in coinmarketcap because when the price of Bitcoin increases, then the price of Altcoin will immediately increase too, but for now when the price of Bitcoin increases and it does not affect for the prices of Altcoin (even still down), then when the price of Bitcoin goes down and at that time the price of Altcoin will go down too, so I do not understand the current state of the market and what is happening right now.
I think it still affects the price of the altcoins. Bitcoin is known to be the most popular and most expensive coin of all time and most of the altcoins gets its support from it. You should always pay attention to the coin you are currently investing to but always make sure too that you watch out for bitcoin's price. You can get a better idea and decision making if you are aware on how bitcoin's getting manipulated. Make actions , even the smallest one would matter in time of desperation.