Given that you're using NeoVim with Markdown files, I did the following search:

https://alternativeto.net/software/obsidian/?feature=markdown-support&platform=online&p=2

This searches for Obsidian alternatives that are web-based and that support Markdown. 13 alternatives are listed. A few of them look like they would meet your needs. Boostnote looks like it might most closely resemble what you're used to. (Bangle.io claims to work with local files, which sounds intriguing, although it hasn't been updated in some months.)