Cryptocurrency is the most valuable in my point of you. So we must always monitor our investment because any huge dump is possible in anytime so we must alert ourself and we must exchange our coin in some critical situation. Because one or two coins are easily maintain in anytime but number of coins are investing and different ratio of split to the investment is hard to monitor in current scenario. If you think some altcoins are not suit for your portfolio just exchange to Bitcoin because this is always trusted cryptocurrency.