Organic Instagram Audience Growth

I want to steadily grow a real community on Instagram over the next four weeks, focusing on people who already care about the topic at the heart of my account rather than random follow-backs or paid boosts... (Budget: ₹1500 - ₹12500 INR, Jobs: Community Management, Competitor Analysis, Content Creation, Content Strategy, Facebook Marketing, Instagram Marketing, Internet Marketing, Social Media Management, Social Media Marketing, Twitter)