Why not read and choose any altcoin which you like on alternate cryptocurrencies section?
And why don't you invest in ETH since it's 2nd biggest cryptocurrency after bitcoin?
Dude he already have invested in ETH maybe he/she doesn't know that he has altcoins in his portfolio. You may visit this link
https://coinmarketcap.com/ for you to know altcoins. You might consider WAVES on your portfolio; I think its a better version ETH.