Thanks, but I wasn’t asking for help, I was asking to see how to best help you.
That Zotfile / mdnotes workflow is quite outdated (from 2020), in the sense that it precedes the Zotero Integration plugin, which arguably revolutionized the Zotero to Obisidian workflow. It makes the integration of Zotero and Obsidian a lot more convenient. It can also extract annotations directly from PDFs, so you don’t need Zotfile for this purpose.
I think you can add tags to your note using the config editor, though. See the Zotero docs: