Having a Masters can possibly be seen as a disadvantage since you’re inexperienced in the field. For the most even and progressive career growth education should be obtained in conjunction with experience. The cath-22 here is that HR Managers usually have Masters Degrees, HR Assistants usually have AS, HR Rep/Assoc. usually have BS. You’ve accidentally placed yourself into the under AND over qualified dilemma here.
What I would recommend is focusing on modifying your resume to reflect the portions of your previous work that have anything to do with HR, and gaining experience immediately through volunteer work and internships as you continue to seek employment (and as someone said - a temp agency may be agood start).
Have you gotten your PHR Certification as well?