Currently the cryptocurrency market is going through a big correction (especially to those who have recently joined). We are seeing coins lose 30-50% of its value in a few days and everyone is panicking. These are the times that will define who will succeed in this market and who will fail. You have to keep your emotions in check and be confident that once you have done proper research in the coins you have invested in they will go up when the market rebounds. Corrections are inevitable and is needed for the overall market to grow. So if you are feeling overwhelmed by the drastic decline in your portfolios just take a few days off and enjoy some sunshine. If you want to be aggressive throw some more fiat into the game and take advantage of the low prices.
Hold the altcoins that you already have, if you have the money then you should buy now that the altcoins are bleeding, best time to buy. Also get ready to wait because prices are going to be low for a long time to come before we see any better prices coming out for the coins, Don't panic sell and don't sell your coins below the price you bought them for