I am a young professional building a career in L&D and OD. Looking for roles with 3 years experience but finding it hard. NEED ADVICE PLS.

I have a masters in anthropology and my undergrad is in psychology. Worked for three years in two startup’s as part of their HR teams. I want to now move into a stable corporate firm (preferably large conglomerates). Are there referrals available? Any certifications you’d recommend? Should I invest in an MBA? I’m willing to take a pay cut and be patient and am a quick learner.