Okay, if you can change your role while preparing for the pre-requisites, that will be very helpful. For example, while preparing for calculus, ML and python, or after doing a course like C++ for Financial Engineering, you can try applying for a role that is a little more towards derivatives/quant side in a bank or Big4. Getting a role would be really hard, but once you get into such a role, you can go further towards the quantitative side by taking more responsibilities. That's what I did while working.