The Owner of the project's smart contract must use multi-signature, and the person holding the keys should only use hardware wallets that support complex signature parsing and have a large screen... From generating the mnemonic to using it, everything should be done within the hardware wallet. Add a Passphrase or use SSS (Shamir's Secret Sharing) for backup to make it more secure... And then, stay calm during regular use, don’t sign things recklessly, and make sure to practice disaster recovery drills. If you’re careless during drills, accidents are bound to happen...