Your eth on the eth chain is not enough, you need to transfer some eth to your wallet, you don't need to cross-chain, you can directly transfer usdt on the eth chain to Binance through the eth chain. Why do you have to cross-chain?

What a loss! Transferred 3000u from the exchange to the wallet without paying attention, and the wallet defaulted to the ETH address. Now, whether buying BNB or transferring back, the fees are surprisingly high! Brothers, is there any way to get cheaper transaction fees now?