You should invest that money into ethereum and monero. Splitting it into two is the best way and making sure that the money is evenly distributed between the two coins. Diversifying is the best thing for you, it is the best way to mitigate the risks when you are investing. If you are looking for another good coin to invest in then you should be looking into neo
Diversifying your investments is a good idea but only if you are investing a lot of money in the market, if your investment is low you are going to lose a lot of money just in transaction fees, so if that is the case it is better to invest everything in a single coin, as long as one of those coins as you say is ethereum or monero or a similar coin like that then you have nothing to be afraid and you will get profits if you invest at the right time in this market.