Random hard work is not guaranteed to get you what you want. In that you are correct. However hard work in a rotating assignment entry program is likely to get you noticed. Why do you think they have those programs? Further once you are "inside" in the rotation program, you can go find the small corp of folks doing exactly what you want and volunteer to help them too. That hard work will pay off hugely.
If all else fails, you are back to your previous plan of going back to school and this job disappears off the end of your resume. No harm no foul. But if you really do make the most of it, these are the kinds of programs that are used to find the true rising stars and get them into senior positions beyond their years.
PS They also often filter for positive attitude. You had best check and keep most of the negativity to yourself. I'm taking a leap of faith to continue to contribute positive suggestions here, but I'm pretty turned off by your posts. If that comes through in person you will likely have a problem advancing.