you can give 2000 Ripple. you can give 5000 Cardano. you can give 50% of 2000 Ripple and 50% of 5000 Cardano. you can sell all these coins and buy a Eth and give it. When the market grows, all coins will rise in price 
You are right, but not all coins will grow rapidly by the end of the year. I think in this case it's better to invest in ETH.