You can create a report that contains the list of volumes that currently reside on FabricPool aggregates, that have a cloud recommendation of Tier, and that have a large amount of cold data. This report can help you decide if you should change the tiering policy for certain volumes to "auto" or "all" to offload more cold (inactive) data to the cloud tier.
Based on the results shown in the report, you may want to use System Manager or the ONTAP CLI to change the tiering policy to "auto" or "all" for certain volumes to offload more cold data to the cloud tier.