Well, Mario has kind of a general appeal, so I won’t call it a niche (but still was in 12th with just physical sale). And Pikmin 4 also sold over 2 Million in just first month or so, IIRC, though not sure if that’s enough for being a top seller in a year like the one we just had.
Also, Tears of the Kingdom was on 5th overall sales, and that’s only with the physical sales. Don’t know the actual number difference between 1st and 5th, but with digital added, it could’ve at least entered top 3, if not gone for 1st.