I'm not aware of any way to recover the account with nothing but the identifier and email address. In theory, there should be no way, because Blockchain.info supposedly doesn't have access to private keys. They shouldn't be able to decrypt the wallet file.
With the legacy Blockchain.info wallet (pre-2017), there is no way to recover the BTC. But they did add HD wallet functionality somewhat recently, which was a big improvement. Now, if you create a new wallet, it is derived from a 12-word seed that can be used to recover the wallet. You can write down the seed and store it in a safe place in case you ever lose access via Blockchain.info. To access your recovery seed, go to: Settings > Security > Wallet recovery phrase > Backup phrase.