I suggest you need to hold not diversified because other altcoins are actually bad and I do not believe in them. I only believe in bitcoin. There are good altcoins in the cryptocurrency market but when you pick at them you will be having hard time. ETH is good but I do not also it would be that good to hold in the long run. Remember ETH once had drop to 190$ and it can happen again once you diversified your crypto investment to these altcoins.