Archiving a project in Jira Data Center is like putting things in a closet – it helps to tidy things up, but there is still more work to be done. What remains and how can it be accomplished? For example, archived projects retain their configurations, even if they are no longer active. To identify unused configurations and mark them for cleanup, it is recommended to establish "archive configuration schemes" for archived projects.
These schemes include default issue type, workflow, issue type screen, field configuration, priority, and notification schemes. It is also a good idea to wait some time before restoring an archived project to ensure the dust has settled.
This article by Brian Mertens of Isos Technology will provide you with insights on how to clean up your Jira Data Center data effectively.