Escalate late approvals, open follow-ups, remind reviewers. Every one is ready to run, and you can adjust it in plain language.
Reopen the reviewer task for your revised artwork.
Your reviewer gets a task ready to review, with the replacement proof and its version named in a comment.
Keep the current design proof and requested review together.
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.