Contact the Cyber Civil Rights Initiative (CCRI) at 844-875-5428 for advice and support.
If the videos have already been posted, you can use services like StopNCII.org to help prevent the images from being shared on major platforms like Facebook and Instagram.
Do not engage with the person making the threats. Block them on all social media platforms and messaging apps.
Giving in to demands (money or more content) rarely stops the behavior; it often leads to further demands.
Reach out to a parent, a counselor, or a trusted adult who can support you through this process.