I lost money to a Snapchat blackmail and I have no clue what to do

Hello, unfortunately I have been caught up with the Snapchat blackmailing scam in this we exchange nude pictures beneath only to discover that the other party is fake and have nude pictures of me and have threatened to post them to my IG friends including my dad on IG. They have already threatened to send some of these to my father, and I know that people say to just block them and nothing will ensue but they are not just bluffing and I don’t want that which has been sent to my father go round reaching everyone. I understand your time is valuable and am grateful if you can offer whatever advice you can.