Personally, I would look in the bluegrass/country styles.

I would tend towards the acoustic styles, keep it sparse, and no drums.

Perhaps a cello or a fiddle real track edited in tastefully for effect and an acoustic, stand up bass that comes in a bit further into the song..... maybe on the first chorus or the second verse.

That song..... done properly, and mastered, could easily be used in film & TV. It's the kind of melancholy and dark music that gets used as the ending song in shows like the Walking Dead and so many others.

You have a piece of magic in your hands with that song.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.