Probably QSY. Since I only call "CQ DX" when I'm on 80-10, if no DX responds, I move to another band. I think I went through 20, 30, 40, and 80 without a hint of DX.
Not sure if you're using JT Alert, but if you are, send me a text message the next time you see me and I'll call you. I never put out a general "CQ" unless I'm on 6m or 160m.