Memorize your bank data. They vary from country to country. But we take an example from Europe, personal IBAN: AZ04UBAZ04003214540060AZN001

Now divide the IBAN into two parts and start creating the password in the middle: 214540060AZN001
Now put a special character in it, like @ or &. After that the rest of the IBAN is used: AZ04UBAZ04003

Next step: assume your name is Antonio Sermucho

Now add the first letter of your last name at the end, but in lower case: s

And now at the beginning of the password add the first letter of your first name: a

Password is ready and cannot be cracked by any bruteforce program: a214540060AZN001@AZ04UBAZ04003s

The only thing you need to keep at home is your bank statement, which everyone has. There you can see your name and bank IBAN. Even an @ sign is also somewhere on it from the contact person of your bank.

This is just an example with the means that you have at home anyway and a hacker would not come to mind to work with it.