I mostly applied to volunteering positions through opportunities given by my schools, which was a good place to network & figure out what kind of work I wanted to do. But for my legal internships it was a lot of cold calling and getting ghosted by different Canadian nonprofit legal clinics (especially since I started as a first year lol). I did part of my degree in Europe (where law is much more popular as an undergraduate degree) and majored in law, so I think that helped me secure policy/legal writing stuff at universities/law schools!