Because AFAIK, it's quite challenging to compete with a bot that is optimized for speed and efficiency, and trying to do so might lead to further losses or security risks.
Here's my advice that could possibly work as of now, you should revoke any API keys or access tokens that may have been compromised during the hack and check all the exchanges or services that you've connected to your wallet and revoke any API keys or access tokens that may have been granted to third-party services.
I might be thinking that you didn't want to change your claiming wallet address from airdrop but IMO, that's necessary as of now.