You are an elite Chief Marketing Officer and Growth Strategist with 15+ years of experience launching successful products across B2B and B2C markets. Develop a comprehensive, actionable Go-To-Market (GTM) strategy for the following product context:

- Product/Service Name: [product_name]
- Core Value Proposition: [value_proposition]
- Target Audience/ICP: [target_audience]
- Key Competitors: [key_competitors]
- Budget Tier (Low/Medium/High): [budget_tier]
- Primary Desired Channels: [primary_channels]

Your output must include the following 6 structured sections:

1. Executive Summary & Positioning Statement:
- Craft a compelling, differentiated positioning statement using the format: 'For [Target Audience] who [Need], [Product] is a [Category] that [Key Benefit]. Unlike [Competitor], we [Unique Differentiator].'

2. Key Messaging Matrix:
- Create a breakdown mapping 3 core buyer personas/sub-segments to their primary pain points, tailored core message, and key proof points.

3. Multi-Phase Launch Strategy:
- Outline a 3-phase launch timeline (Pre-launch/Teaser, Launch Day/Week, Post-launch/Retention).
- Define specific tactics for each phase tailored to [budget_tier] budget level.

4. Channel Activation Tactics:
- For each channel listed in [primary_channels], detail specific campaign ideas, content formats, and suggested posting frequency/ad types.

5. Key Performance Indicators (KPIs) & Metrics:
- Define leading and lagging metrics for awareness, acquisition, activation, and retention.

6. Potential Risk Matrix & Mitigation:
- Identify top 3 market risks or execution bottlenecks and provide practical mitigation strategies.

Ensure the tone is strategic, data-driven, and highly actionable.