Of course without doubt there will be gains this year too, due to high demand and new user's and entering the crypto market which makes the prices to shoot high, so it is better to invest now on cryptos, bitcoins will helps get huge returns whereas altcoins will get good returns in the long run as there is a steady increase in the altcoin market. It is quite natural in any financial market for a hike and drop in the market and normally investors invest when there price is low and sell them when there is a hike in the market which gets them good profits.