If we compared the price of the altcoins in december 2017 and today the price is better on the alst year but I believe even the price decrease it will become very high again so don't worry and you will see the price increasing again.
This year will be harder than 2017 because in 2017, people saw only bull trend due to amazingly increased demand for crypto currencies. The market is not that hungry now. Yet, it will still grow properly for altcoins.