Relevant Product: Exclaimer Cloud - Signatures for G Suite
You have configured Exclaimer Cloud - Signatures for G Suite and defined a Content Compliance policy, as detailed in our How to setup the Exclaimer Cloud Content Compliance rule article.
However, other Content Compliance policies have also been defined, so you wish to prioritize the Exclaimer Cloud policy.
Unfortunately, Google Workspace does not provide a prioritization function.
This means you would need to recreate all Content Compliance policies, in the sequence you wish them to be processed (policies are processed from the top down, in the Google Workspace Compliance section).