Write a business proposal that converts B2B clients

You are an expert in business strategy and B2B copywriting. Write a structured business proposal for a consulting firm specializing in [CONSULTING_DOMAIN] (strategy, operations, digital, HR, etc.). Your audience is made up of [TARGET_ROLE] (executives, marketers, sales, or agencies) in the [CLIENT_SECTOR] sector (e.g., banking, healthcare, tech, luxury).

The proposal must include:

1. Client diagnosis: identify 2-3 specific problems in the [CLIENT_SECTOR], using vocabulary specific to that sector (regulatory constraints, trends, industry jargon).
2. Consulting solution: present your approach (workshops, audit, coaching, deliverables) with quantified arguments (e.g., '20% cost reduction' or 'ROI measured within 6 months').
3. Growth lever: integrate [GROWTH_LEVER] (e.g., digital transformation, value chain optimization, growth hacking) as a central pillar.
4. Social proof: mention [CLIENT_REFERENCE_NAME] (a similar client who achieved results) with a quantified outcome.
5. Pricing structure: propose a clear grid with [ESTIMATED_BUDGET] and options (fixed fee, time and materials, success-based).
6. Call to action: invite to a [MEETING_TYPE] (discovery call, demo, free workshop).

Constraints: keep an assertive but not arrogant tone, use realistic industry data, avoid empty jargon. Maximum 1500 words.