Offer specialized prompt engineering services to optimize AI model performance for businesses using ChatGPT, Claude, GPT-4, and other LLMs. Create custom prompt libraries, develop prompt optimization workflows, and train teams on prompt best practices. Income: $3,500-15,000/month. Skills: Deep understanding of LLM behavior, prompt optimization techniques, natural language processing fundamentals. Tools: OpenAI API, Anthropic Claude, prompt testing frameworks, version control systems. Target: Software companies, marketing agencies, content creators, customer service teams. Difficulty: Intermediate - requires technical AI knowledge and experimentation mindset.