now Bitcoin price has increased 17.5% in the last 7 days and now the price is $27,750.69, then BTC Domination is 70.9% with Market Cap amount $727,677,130,354, but Ethereum price is currently $644.61 and is down 1.44% from the last 7 days, so I bought Ethereum with all my money (money that I use specifically for investment), because I believe Ethereum price will soon increase very high (bull run) following Bitcoin price movement and of course I will get a very big profit from investing in Ethereum (my target for Ethereum price is $1100-$1400), because I believe if Bitcoin dominance decreases, then it will make the price of altcoin increases (including the price of Ethereum).
You probably didn't choose wrong, nobody really knows what's gonna happen in the future though.
Altcoin season will come, don't know yet how big is it gonna be (2017 big or less) but it will come. And 'cause of that investing in ETH is probably a good choice.
You could still make more when investing in altcoins different from ETH for altcoin bull but this comes with some risk.