Help! Snapchat user is threatening to send my nude photos. What should I do?

Hi,

I have a big problem. I (unfortunately) messaged someone through a sexting site. I already regret this mistake, please don't call my attention to it. I created a separate Snap account just for messaging women (I'm stopping that now). Well, this person wanted to "make sure" I was real. So I sent the person a picture of myself and my private parts. The person only threatened me in response, demanding a $200 ransom. As I said, I have a separate account, so I don't have any friends or family saved there. They then spammed me with more threats and calls. I reported their account, and the report was received. I've now deleted this account. I never posted anything on it, declined to share my location, and didn't share any information. Am I still under threat? Should I take further action? I'm doing my best to stay calm. I'm eagerly awaiting answers!