VR, GPUs, graphics are a niche area and most jobs require both experience and some qualifications. Perhaps you could get some general developer experience while

VR, GPUs, graphics are a niche area and most jobs require both experience and some qualifications. Perhaps you could get some general developer experience while you wait for your PR and then make the decision whether you still need the M.Sc. If you like learning then doing any formal courses is useful. But experience is, generally, far more highly regarded than qualifications. You could re-contact the places where you interviewed and ask for feedback as to what areas they found you lacking. Then focus on improvements in those areas.