Escalate late approvals, open follow-ups, remind reviewers. Every one is ready to run, and you can adjust it in plain language.
Expose gaps in proof handoffs before reviewers take them on.
Your team gets a clear review packet on the task, or a visible note about what the proof still needs before a reviewer can act.
Bring changed asset deadlines to campaign owners for follow-up.
Your campaign owner sees deadline changes beside assets in review, so they can confirm the reviewer still has time.