Why would you want to restructure your noted just to add more meta data?
I just leave it as it is. But my notes are categories in their own vaults so there is never a need to Refactor previous notes to a new form as they don't interact with each other anyway.
Well it's not just meta data. I write only the bare necessities in an actual YAML header, the rest of the front matter goes into a comment section below that. This gives me the option to add links as meta data. What I would like to do is to embed older notes with LATCH. This would help with cataloging and indexing, which would in turn help with identifying merge-able topics, relating topics and reviewing notes.