Double major or minor?

Hi, I am majoring in International Development Studies but I am a bit nervous about the future. I feel that I should pair this major with either a bit more technical of a major or minor. I was thinking of double majoring or minoring in Spanish, statistics or possibly public heath. I guess I am a bit confused about how difficult this would be because I am not sure how many classes would overlap. Do you think any of these combinations are plausible or would help me in the future?
Thanks!