Glad to hear you have a thirst for more knowledge and education! Definitely an admirable trait for anyone in this industry.
Keeping credibility in mind, what type of client do you hope to attract?
What certifications are out there that would help you specialize in training this type of individual?
Let me know your thoughts and I’ll be able to make a more specific recommendation of certifications and particular agencies that might interest you. Hope to hear back from you soon!