Need Help - Deleting Export/Import Dependencies In Order To Delete Contact Fields

Hi all,

Need some help. We are trying to go through and remove a bunch of old fields that are no longer used. There are a ton of dependencies that prevent the deletion - mostly bulk import and exports. We go into Postman and use the API to delete them, but they just all come back! How do we delete these and keep them away so that we can delete these fields? Any ideas?