Rising Junior looking for tips for ECs, academics, etc.

This upcoming summer, I'll be a Junior. I'm looking for tips and ideas for what I could be doing to help my future. I aspire to study abroad in another country (Iceland especially), become a foreign service officer, work in the legal/public policy field. I think running for public office one day would be amazing. Most likely, due to tight finances however, I'd begin in community college and transfer later on. I'm considering a few different majors, like Public policy analysis, International Studies. I'd appreciate general tips, EC ideas, things I can do/study over the summer or junior year.

My ECs are decent I think, but not focused or long-term. The only extracurriculars I've participated in so far was 2 essay contests(never won), Newspaper club (World News and Culture editor for 1 yr, though not much got done so I probably won't join next year, unless I have a chance to become an editor in chief), a free summer program with the city planning commission (which I'm likely attending this summer), and a 6 week graphic design internship with the public library system. I feel like they could be better, or at least more focused in my field of choice. I've done some volunteering as well.

I have a decent GPA (At least a 3.5) and course rigor (all honors, 1 ap class and exam already taken, and more honors and AP planned for this upcoming school year). I've never taken the PSAT, SAT, or ACT, so I don't have test scores.

I know I should technically focus on what I'd like to major in and build a "spike" like most people suggest but my interests are varied and I haven't found many opportunities in my state. I appreciate any and all tips.