Hey there
I'm going into my second year of Commerce (clearly not Economics) but I do have a few suggestions since the two sometimes overlap. I don't know what you plan on doing after graduation, but it couldn't hurt to take a poli sci course. It could come in handy if you end up working for the government, but is useful knowledge because of the relationship between politics and economics (ie. fiscal policy, the economy in general, etc). If you like it that much you could even consider a minor in it, and depending on how you feel about reading and writing essays it could be a welcomed change to the math-based economics courses.
Another option would be to take commerce courses. I'm not sure if they're open to non-commerce students or not, but they're pretty practical and probably worth looking into. Chances are, especially with a degree in economics, you'll have to deal with business at some point down the road so again it's just good general knowledge to have.
Last option would be labour studies courses. Again, a reading/writing based courses, but could contribute to the future. It would be good to look into if you were every considering human resource work and could open up more job options, especially if you wanted to minor in it.
If you're not too concerned about minors, how the courses will affect your future and everything else I've been talking about, there's always taking courses out of pure interest (which is better than taking a course simply because you need a credit).
Hopefully this helped. Good luck