I also tried to build my own Obsidian[^1] a few months ago.
However, I stopped using it after some time, since maintaining it would realistically be a full-time job. What I also found super annoying was the feeling that I'm never done with it. Whenever I encountered a rough edge or missing feature, I had to (obviously) implement it myself.
All in all, I find Obsidian as good as it gets. Also, Obsidian is probably one of the best options in terms of longevity, as all notes are just Markdown files, no proprietary DBs or other BS that could lock you in.