He does not recognize my mnemonic words and offers an alternative to fix everyone.
Also in the list (Create a random mnemonics, or enter your own below I do not find - 20 words. only 15,18,21,24
you should've written down the new 12 word recovery phrase
if you still have old wallet backup saved in your email, maybe you can decode the file manually
you can somehow use old password on your old wallet backup to reveal private keys of your addresses
The access to the email is also lost( there are other options?
If the email is linked to any of your other email address or any of your mobile number you can still gain access to the email by doing a password recovery and follow the instructions. If you can get access to the you used to can get back to you bc.info account