Am I stuck with my Secondary stat?

We've had quite a few events where they gave out AP resets.
Just wait it out and you'll come across one again someday.

May it be some event shop or a hot-time/hotday. You'll see.

When Tempest arrived and changed the stats, we had SEVERAL hot days that gave out SP and AP reset scrolls. It was more than enough to fix all the AP on every character I needed to. It was easily 4-6 per account. And since then we have had a few more. There was an AP reset hot day in late April/early May most recently.