Facebook SEO Backlink Promotion

I run a small online marketplace page on Facebook. Product photography, image editing and day-to-day posting are already in my hands, yet organic reach is still limited. What I need now is a focused Facebook-specific SEO boost built around backlinking and smart cross-promotion... (Budget: ₹750 - ₹1250 INR, Jobs: Content Marketing, Digital Marketing, Facebook Marketing, Internet Marketing, Link Building, Marketing, SEO, Social Media Marketing)