Sometime ago I read a blog post that recommend the following percentage of coin's portfolio one should hold: "Bitcoin 50%,ethereum 10%, ripple 10% ,zcash 10% and 10% for new coins that are being listed in exchange platforms, another 10% for ico projects". I think his recommendation is worthwhile and after follow them for some time now I have no regrets. Your current holdings is not too bad too and you can still expend it. Good luck to your investment.