OK, I'm sorry — I read your previous post on the go. _DIRECTORY and _FILENAME are not available as fields at Convert → Tag - Tag for the Mac version.
It's possible that your files now have a _DIRECTORY field, which you can double-check and remove via View → Extended Tags....
To achieve your goal, you can an action Format tag field, which fills fields or renames files and folders based on other fields content or fixed text.
This action also offers _DIRECTORY and _FILENAME as fields, where the former really renames the directory of the files. This means, that other files like PDF, JPG, & PNG files in the folder would also be moved to the new folder.
You can try this action type via Actions → Quick Actions → Format tag field and if you are happy with your experiments, you could create via Actions → Actions an action group "Move Files" with one or two actions Format tag field one for _DIRECTORY (which renames the containing folder) and one for _FILENAME (which renames the files).