I have setup Joplin a few weeks ago and I really enjoy using it. AFAIK it is not as powerful as something like Notion or Obsidian, but it just works. And is already miles better than using loose txt files, like I was before.
But to be fair, I was looking for a 'real-time' webbased app, like Notion. But I wanted it to be self-hosted, use Markdown for formatting, (a little) polished and easy to setup and maintain. And while Joplin isn't perfect, or even fits all of my criteria, it was a close second. Even if it has it's drawbacks.