I agree that’s very modest, compared to most contributors to this site, and I certainly would not dissuade you from trying a mandolin, mandola, bouzouki or even triple but your arrangement will not really work on those instruments if it relies on a guitar like tuning or picking arrangement; I tried finger picking a mandolin years back, and it just didn’t come together, and decided to learn to play it properly instead and never looked back. If you are wedded to tunings in fourths, you might want to try the five string banjo, if you mute the volume with a bridge mute; you’ll have a close guitar tuning without the lower bass strings.