What should an actionable TikTok Shop GMV Max diagnostic report include?

We are building Tec-Pulse for TikTok Shop sellers who need to understand why a GMV Max campaign changed before changing budget or ROI targets. The first version combines account-level checks with free browser tools such as ROAS and CPA calculators, shop policy checks, campaign diagnostics, and simple video utilities.

For people who run or audit shops: what would make a diagnostic report useful enough to act on? Which signals, explanations, or recommended next steps are usually missing from dashboards? We are looking for practical feedback, not votes.