Oh. High risk, Very high risk dude. Why do you forgot about diversification? Buy some Ethereum, to my mind - 5% it's the comfortable amount of Ethereum in portfolio
If you have for example only 1000 dollars of Bitcoin then it's not wise to spread only %5. You can't gain much with 50 dollars of Ethereum anyway. It's best to diversificate based on total amount. He could be a big investor, %5 is enough, or little fish, he needs to put %50 of his money to ETH.