We all know that Bitcoin's private key consists of 256 numbers or letters. However, with the adoption of bitcoin on a large scale. BTC accounts will be more and more. When the number of Bitcoin accounts is large enough, any 256 numbers and combinations of letters may be a private key. People can rely on guesswork to get bitcoin in their account.
i think the private key of Bitcoin should not be a fixed 256 bit. it should be able to change in an interval. the user can select the number of digits of its private key. For example: between 500 characters and 256 characters.
Why is it a public number: 256 bits?
The character of the private key is a privacy. The number of digits in the private key should also be a privacy.
I was thinking about that lately, not just a supercomputer but a manual guess might be also possible, but we have already an additional security for it like an own password, perhaps there will be more additional security to be implemented to ensure that everything is okay.