I was also afraid after seeing this topic. I am also using blockchain and just remembered how the password system works there.. Luckily i have set password which is eassy to remember for me. I will not change it as they will notify if somebody even knows my identifier and i will not give permission.
We cannot change first password on blockchain.info
They already give caution to "Save" Mnemonic in secure place, or maybe write it in your book.
I hope you can keep try to remember what is your password. (All saved passwords)
And also you can seek new probabilty typos that can be saved as your "password".
Ex: your password is: P@s5W0rD
if you sure your password is above.
Then keep trying to seek new probabilty for your login.
maybe you make some typos when you make symbols (you press shift, but actually you are not)
so your probabilty is: P2s5W0rD
Don't give up to find your mnemonic.
Best Regards.
And i think you better not lock this topic. There are a lot people who can help you in this BTT forum.