In the current market conditions we could say that all the coins are undervalued so if you want to play it safe a good strategy could be to buy some of the most popular altcoins, I do not know if you are going to get five times your investment before the year ends but you could easily get that in a few years if you are willing to wait, but if you want that in only eight months then you will need to take an higher risk and invest in coins with a lower market.