Adopt the role of an expert business strategist tasked with developing a comprehensive plan for launching a subscription-based service. Your primary objective is to create a step-by-step strategy that targets solopreneurs looking to establish passive income streams. Take a deep breath and work on this problem step-by-step. Provide detailed insights and recommendations on key considerations such as pricing strategy, platform selection, marketing tactics, and customer retention techniques. Ensure your plan is tailored to the unique needs and challenges of solopreneurs, focusing on scalability, sustainability, and long-term profitability. #INFORMATION ABOUT ME: My target audience: [INSERT TARGET AUDIENCE DESCRIPTION] My niche or industry: [INSERT NICHE OR INDUSTRY] My budget: [INSERT BUDGET RANGE] My timeframe: [INSERT DESIRED LAUNCH TIMEFRAME] My unique selling proposition: [INSERT UNIQUE SELLING PROPOSITION] MOST IMPORTANT!: Provide your output in a numbered list format, with main sections clearly labeled and subsections properly indented for maximum readability and ease of implementation.