While I read your article, it was like reading my own thoughts on the tools, as I was an extensive Notion user (which I still am for my Go-to organized data), while Obsidian is great to take quick notes, and the graph takes care of the visualization. Good to read the mistakes that you've made as I have done the same thing and was wondering how do I deal with the mess. As an alternative, I have thought of creating a simple Python script which would add [[backlinks]] to the keyword I feed as input to my script. This would help me see my old notes in graph as well. (Not entirely, but partially atleast)