Before reaching out to Blockchain.com support, I would try at least using BTCRecover tool[1] on that file. The tool allows you to dump/decrypt your wallet, provided that the password that you have is correct. Run the line of code that is mentioned in the documentation and you'll obtain a .txt file where you'll see the private keys associated with your wallet.
Next step would be to import them[2] or, better yet, sweep them[1] into a wallet like Electrum. As always, you should do these operations in an airgapped environment to ensure the safety of the operation.
PS: As always, make a copy of your file before running this tool, just in case something bad happens.