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Yes bitcoin and altcoins are in huge dip and you can buy as this is the perfect time to buy any crypto coin you will get profit this is 100% sure.
Look after any safe coin and buy this will easily give you 5* return if you hold coin till 2018 end . You need to diversify your coins and buy different coins according to budget do not step in into one coin which might take some time to grow we cannot predict the future.

Thanks 4 your positive response.

its better to buy it partially because altcoins will increase more times than bitcoin and bitcoin will increase when people bought it

Buying a coin is always a tricky decision to make. Especially when we have large numbers of coins. Mostly what people do is to buy the most trending coin and try to avoid the small value alt coins.
I’m of the view to buy alt coins instead of BTC at the movement. The reasons behind this are:-
They are cheaper as compared to BTC. Therefore, I can buy different number of Altcoins in huge quantity.
Secondly, some Altcoins are at the movement undervalued and can have a great chance to excel.