Any advice on how to get into public policy regarding oceans?

I'm a first year studying Ocean Science and was wondering if anyone has advice on how to enter the world of public policy and governmental decisions regarding marine conservation and management of the oceans? I have a job this summer working with seabed mapping (computer based stuff) but am interested on focusing more on the humanities side of the ocean in the future

I'm a strong writer and did some policy-planning clubs in high school but nothing so far in uni, mostly just STEM-skills (coding, sonar, mapping techniques, etc). I'm from the US but doing my undergrad in England and willing to relocate/work with any country/legislative body.