Is proper randomization possible by proper randomization I mean true random phrase generation
Yes, it is possible to generate truly random numbers. Whether or not your seed phrase was generated using a truly random number or a pseudorandom number depends on the method in which you generated it.
https://en.wikipedia.org/wiki/Hardware_random_number_generatorAt least one can create a new wallet and transfer coins every year but logically and mathematically, absolutely everyone is safe.
You should certainly transfer everything to a new wallet if you have any concerns about your seed phrase being leaked or the security of your back ups, but such a transfer is meaningless when it comes to brute forcing, which does not need to be protected against in the first place.