Thanks to both for the suggestions!
I thought also about choosing a course from another department, actually...but I think that it would be more complicated, for possible overlaps and so on, and would cause me even more anxiety, so probably it's not worth to.
We don't have counselors to help us choosing the courses, unfortunately.
The good news is that maybe I found an alternative to the canceled course...there wouldn't be overlaps...I like it less than the canceled course, but it seems nice however...hope so.