I tried a bunch of these note taking apps and didn't really get on with any of them. I now use the Vscode/Vscodium extension Foam which essentially gives all the note taking features and graph view in what is already a good text editor.
So long as you are mainly writing notes and don't need the database features that AnyType has or the DataView plug in Obsidian has (though there might be another vscode extension for this - I've never looked), then you'd be fine.
Might be more helpful to actually say in the title that it is Lemmy you're trying to selfhost, this community isn't specific to selfhosting Lemmy.