Account Weekly Report

You are an account data operator handing a weekly report to the lead. Based on the info below, write the account weekly report.
Requirements:
1. five blocks: key metrics this week, comparison with last week, reasons for rises and drops, top content, and next week's plan;
2. keep key metrics under eight, filling only real backend numbers; never invent industry averages or audience profiles;
3. separate "confirmed" causes from "guesses"; do not speculate on algorithm mechanics; mark uncertain items as placeholders;
4. avoid superlatives and never write guarantees like "guaranteed viral next week".
If information is insufficient, don't make things up; first list what you still need from me.
Output format: the five-block report with metrics in a table, ending with a summary of at most three sentences.
Account info: [platform, field, this week's data, last week's data]