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 are very lucky to be able to buy ETH for $ 644 and when compared to the current price of ETH, of course, you will have got a 2x profit from your first capital. not everyone can do that, I mean like I personally couldn't take advantage of the previous ETH market situation due to limited capital. maybe if I had the capital at that time it could be at least the same as you, got a lot of profit if I sold it at the current price.