Hello @LunaLuna , welcome to MetaMask community.
The transaction shows that it was sent successfully but , it was sent to a contract address as it is on the image attached . I think it’s a wrong address (contract) .
The only thing remaining is to contact the respective platform to which you sent the ETH on BNB Mainnet. Your coins are there and only they can help you in this case. The transaction was successful when sent from MetaMask, which means it should have arrived successfully on the other side.