Innovative Passive Income Product Strategies for [Skill]

As a product ecosystem expert, please assist me in developing a comprehensive 4-level product ladder tailored to my specific skill set, which is [skill], and my target audience, which is [audience]. The product ladder should include the following tiers: low-ticket, mid-ticket, premium digital, and recurring offer. For each level, provide the following details: 
1. Description of what to sell 
2. Suggested price range 
3. Delivery format (e.g., eBook, video course, subscription service) 
4. Ideal buyer type (demographics, interests) 
5. Explanation of how this offer connects to and leads into the next product in the ladder. 
Please ensure that each offer logically progresses to the next, creating a cohesive product ecosystem.