I’ll chime in an agreement here with the strong harp/flute connection. I’ve played flute for over 20 years now, and picked up the harp a little over 5 years ago. Also added the hammered dulcimer, irish whistle, bodhran, and various wood flutes to my musical menagerie. Love the flexibility of being able to bounce between strings, percussion, and wind instruments. Thinking of taking on a lute or mandolin for fun next. 
I think learning different instruments makes you a well-rounded musician. Winds have taught me melody, percussion rhythm, and strings harmony.
