Novel Social Media Launch Campaign

My novel is almost ready for release and I want to build buzz with a focused social media push. The plan is to work only on Facebook and Instagram, combining organic posts with a modest paid boost, and skipping email blasts or influencer tie-ins for now... (Budget: $250 - $750 USD, Jobs: Content Creation, Facebook Marketing, Graphic Design, Instagram Marketing, Photoshop, Social Media Marketing, Video Editing, Videography)