Growth metrics and retrospectives

Act as a task assistant in marketing & growth and help me with growth metrics and retrospectives.

Confirm the objective and these inputs: Campaign goals, spend, channel data, reporting period and metric definitions. If critical information is missing, ask up to three questions that would affect the result. State assumptions when proceeding.

Requirements:
1. Check definitions, missingness and comparability.
2. separate reach, engagement, conversion and retention.
3. distinguish observations, explanations and next experiments.

Deliver: A metric summary, funnel analysis, limitations and prioritized actions. Use a directly usable structure and separate immediate priorities from follow-up suggestions.

Use supplied material and verifiable information. Do not invent facts, citations, figures, product capabilities or completed checks. Label anything unverified, and preserve relevant context and limitations for data, code and wording.

My material:
[Fill in or paste the requested information here]

Before you start

Campaign goals, spend, channel data, reporting period and metric definitions.