The banjo samples sound really short, like they are intended more for strumming or very fast picking, compared to these live banjo examples-
https://www.youtube.com/watch?v=ulHdv8vEjXc
https://www.harpkit.com/mountain-banjo.html (a few idiomatic demos on that page)
They also don't sound like they have RR; even though you did a good job playing with dynamics, maybe something like an old upright piano or even a zither would work better while still fitting that 'old American' feel?
https://www.youtube.com/watch?v=ulHdv8vEjXc
https://www.harpkit.com/mountain-banjo.html (a few idiomatic demos on that page)
They also don't sound like they have RR; even though you did a good job playing with dynamics, maybe something like an old upright piano or even a zither would work better while still fitting that 'old American' feel?
Sample library developer, composer, and amateur organologist at Versilian Studios.