That's a normal recovery phase after such intensive effort. It'll pass, and then you'll see the ways this thing has helped you grow as a writer and an individual. Sounds trite, but it's a real thing and quite nice to experience. Just go with the flow.
And then after some time, you'll get a little restless, get curious about something, and suddenly there you are, deep in another project.
I'll mention this on Wordpress, too, but congrats on bringing that event to life on so many levels. Thanks for sharing it with us all!