I am investing only a small proportion of my capital in altcoins, because taking into account the great growth potential that bitcoin and ethereum still have, my two favorite cryptos, I have decided to keep most of my assets in those two coins. Maybe at this moment I am only investing 20% of my capital in altcoins, but I must admit that given the great profitability they are generating, I may increase my investment up to 30-40%.
I would still in your place consider those coins that are associated with new high-tech fast blockades, I think that in 2018 it is these coins that will grow actively and give a huge profit