Its considered very bad trading strategy to sell all coins for one coin. we should always diversify our portfolio and choose top coins at least 5. sometimes one coin face some issue which not allow it to go high like current position of bnb. many coins are recovering with the increase price of btc but BNB still struggling and selling pressure is very high not allow bnb to go high
And getting ethereum is not a bad choice, now I know that compared to a new altcoin ethereum does not hold the same potential to grow, but at the same time the risk is many times smaller, and when I take into account the risk-reward ratio then there is no doubt in my mind that ethereum is a way better investment that the majority of coins out there, with only bitcoin being ahead of it.