Must it go dormant?

It doesn't look like it's thinking about it yet, but that guy is definitely going to take a nap.

Having nothing to do with Plumeria or naps, in your profile, I think the 28803 is your ZIP code? If so, you can use that to look up your gardening zone on this site. You might already know that and just aren't interested in changing your display. Clicking this will take you right to your zone, if interested:
https://garden.org/nga/zipzone...

Had to smile when his image showed Him & his Plumeria 'going dormant'

@Mykate88 beautiful looking plumeria. I don't force my plumeria to go dormant but once you withhold watering leaves will turn yellow and drop off forcing it into dormancy. Then keep the soil dry through winter so it will not rot , and be ready to wake up in spring.