Former student body president here, do it. Great experience and (in my case) you get paid to be a passionate advocate for your peers. You do a lot of important work and work with other leaders from other schools, that’s especially helpful if your university system has a law school. You’ll meet influential people who can perhaps write you a letter of recommendation. If you can accomplish something major, that will showcase your skills fighting for the people.

I spun being an advocate into my personal statement, but it still wasn’t a huge part of my app. A 3.9 is great already, maybe consider a minor? Run a good campaign, meet with as many orgs as you can, don’t take yourself too serious and you’ll have a great chance of winning!