How to best position myself at this point for a solid junior offer?

I'm a rising sophomore who is basically doing very little during the summer between freshman and sophomore year. I'm doing an unpaid private wealth management internship for a couple months three days a week in a mid-to-small city, and am just getting a job as a salesperson to make some extra spending money.

The private wealth management internship at a local place was really the only finance-related internship I could get. All the other internships I got were at nonprofits, educational summer camps, and things like that.

I have a 3.7 GPA at an Ivy. I don't really know what I am majoring in at this point, but I'm probably going to declare Economics. I'm open to majoring in other fields though, as Economics at my school is basically like just taking math classes.

My question is how to position myself at this point? Just thinking about the kids who got solid internships after freshman year at my school, and the majority are computer science people, as tech companies seem to offer more freshman opportunities. I know a few kids with huge family connections who were able to score really solid gigs after freshman year, but I don't feel too far behind.

Any advice on what to focus on now for a BB banking internship my junior summer? Do I probably need to aim for a MM banking internship my sophomore year, or try to get into one of those mostly-URM BB sophomore rotation programs?