If you want to make profit you do not need to be greedy. 20-50 percent for each coin is an amazing profit on a falling market. Do not make this mistake to await 1000 percent profit for each single coin or you will be left with nothing.
20-50 percents in altcoins looks like tears. At least x2-x5 is good enough. Moreover now many altcoins already fallen deep and buying now could get x-profit with high probability.