The price of ETH now has not dropped dramatically, the price is still between 0.08 btc from yesterday (it was up to 0.12 BTC / ETH but not for long). Seeing that almost all of the altcoins including bitcoin are down right now, I think it's better for you to wait for a few days to buy ETH if you still have a stock of btc. If there is still an ETH, you can sell now if there is a need or you can hold it, but for the long term.