Find a couple friends that are traveling over Christmas and upgrade them. I'm upgrading my brother-in-law YYC-YYT-YYC as his Christmas present and that will leave me with 3 left at the end of the year.
I originally thought I'd spend a lot of time in Y this year, but a healthy balance of good Z fares (45%) and T+ upgrades (31%) put me in J for 76% of my ~50,000 miles.