Structured data missing recommended fields
What this means
A JSON-LD entity is valid but omits properties that would unlock a richer result. Nothing is broken; the richer presentation is simply unavailable.
How to fix it
Add any of these properties that reflect real, verifiable content. Where you have no genuine data — no reviews, no ratings — leave them out: fabricated review markup violates Google's policies.
Fix effort
This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.
Authoritative source
https://developers.google.com/search/docs/appearance/structured-data/intro-structured-data
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