One advise, having your money doubled in an altcoin investment is already good enough and so sell your coins right away. Do not be greedy. Trading is just like gambling, the more greedy you are, the more risk that you are taking, and the more chances of you losing in the long run. Another advise is to put some of your altcoins in the exchanger site but not all of them. This is just so that you can take action right away if there comes a pump. Sometimes the transaction time is too much that once you have received the coin in the exchange, it's already too late and the pump is already over.