GEA reporting fails for a predictable reason: it is presented as a dashboard when it needs to be presented as a narrative. Clients cannot benchmark citation share against anything they already know, so a grid of unfamiliar numbers reads as activity rather than progress. Lead with the story and put the grid behind it.
Use a four-part structure. Where we gained, and on which situations. Where we lost, and to whom. What we learned about how the engines are treating this category. What we will do next month, with the expected effect. Every number in the report should serve one of those four parts.
Name competitors explicitly when they displace you. "Competitor B now answers the data-residency prompt because they published a regional hosting page in August" is the single most valuable sentence you can put in front of a client, it makes the mechanism visible and turns the next workstream into an obvious decision rather than an agency request.
Translate citation movement into commercial language once per report. Tie gains to the pipeline instrumented from answer traffic, and be honest about the lag: evidence shipped in month one usually shows up in citation share in month two and in pipeline in month three. Setting that cadence early stops month-two panic.
Show the monitoring set itself at least quarterly. Letting the client read the actual prompts you are competing on, in buyer language, is what converts GEA from an abstract service into something their own team argues about productively. Clients who can edit the prompt list stay.
Close every report with the open ground: monitored prompts where no brand is named well. It is the most persuasive slide in the deck, because it is the one place where the client can see unclaimed territory and decide to fund it.