I advise you not to sell all Bitcoin to invest in Ethereum. I know Ethereum is one of the best altcoin, it's very promising. But you should not sell all the Bitcoin you hold. Because Bitcoin is the king of crypto, it has great power. In the future it is possible Bitcoin prices will go to the moon, many experts predict Bitcoin will end this year over $ 25,000. So I think it's best to invest in both Bitcoin and Ethereum.