You can hodl bnb right now. Bitcoin has increased it's price then the other coins and altcoins will increase too so it will be a good decision to hodl plus other altcoins are not using the ethereum network.
Not only BNB, but Ethereum is also very good to keep from now on because Ethereum also often recovers faster than other coins in the crypto space, so it wouldn't be wrong if someone wanted to keep both as well.