I think the majority of altcoin will decline if the bitcoin itself is in a bad period so to anticipate the occurrence of losses you should often often see the movement of bitcoin every time.
Amongst all the altcoins which are there in this world, ETH is the most favorite coin and that it is being most widely used altcoin having the highest demand in the international market. By looking at all these facts, we are easily convinced that the market value of ETH will rise higher and that we need to stay patient and that we need to wait for the right time before things start turning in our favor.