On the contrary, I think you should buy more bitcoin. Ethereum is just an altcoin. Although Ethereum is also very promising, it is not stable enough, it is easy to be manipulated by artificial price, and bitcoin is more reliable.
i still think ETH is promising altcoins, it may be unstable now but in the future, it will be a great choice if we dare to invest in ETH, despite the fact there are many rumors of populous people said ETH is shitcoin, i still dont think ETH is that bad, it is still the most common altcoin of all, so it still have the chance to rise up in the future.