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Currently, Microsoft Q&A does not support Fabric-related issues. Please try posting your question in the official Microsoft Fabric community here: https://community.fabric.microsoft.com/
That said, based on the behavior you described, this is expected when a Microsoft Fabric trial capacity expires, and it is important to act quickly to determine recoverability.
When the Fabric trial expires, the associated workspaces are automatically moved from the trial capacity to shared (Pro) capacity. As a result, non-Power BI Fabric artifacts such as Lakehouses, pipelines, dataflows, and other Fabric items become unusable immediately, which can make it appear as though all data and objects are missing.
However, this does not mean the data is immediately deleted.
Microsoft provides a retention window of approximately 7 days after trial expiration, during which the objects and data are still retained in the backend and can be fully recovered by assigning the workspace to a valid Fabric (F SKU) or Premium capacity.
If you upgrade to a paid Fabric capacity and reassign the affected workspaces within this retention period, all previously created objects and data should be restored in full.
If the retention window has already passed, then non-Power BI Fabric artifacts are permanently deleted and cannot be recovered. Power BI artifacts (such as reports and datasets) may still exist but may require reassignment to a supported capacity to become usable.
I recommend verifying when the trial expired and, if still within the retention window, assigning the workspaces to a paid capacity as soon as possible to recover your environment.
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