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Unfortunately you can't decrease the allocated size after the instance is created. Please refer to this article on how to decrease the total provisioned storage size.
When restoring an Amazon RDS instance from a snapshot, the minimum allocated storage size for the new instance is determined by the maximum storage size ever used by the original instance. If the original instance's storage was increased to 3000GB at any point, the new instance cannot be restored with a smaller storage size, even if the current usage is only around 1300GB. Check here for more information Restoring from a snapshot.
Possible Solution:
To work around this limitation, export the data from the original instance and import it into a new instance with the desired storage size of 1500GB. This process involves creating a new RDS instance with the desired storage size, using a database export tool to export the data from the old instance, and then importing the data into the new instance. Once the data transfer is complete and the new instance is functioning correctly, the old instance can be deleted.
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