In your own space, create your own challenge. What’s something you want to see more people doing in fandom? Is there something you’ve tried that you think other people would enjoy if they gave it a go? Dare your friends to try it out, and have fun with it. Leave a comment in this post saying you did it. Include a link to your post if you feel comfortable doing so.
I had to think about it, but here goes:
Go back to an old project and give it some new energy. Add a chapter to the WIP you abandoned two years ago, revise a piece of art that could have benefited from the improved skill you have now, fill a request that someone forgot they gave you, redesign your aging website, or just talk about the character/s that got you into fandom (assuming you've moved on since then).
I had a lot of fun with this kind of thing in 2015, and while I don't know how I'll apply it next, I'm reluctant in general to ever let something die before it's finished. It's harder to find the inspiration when the work isn't fresh, but that's what makes it a challenge. I would love to see what my friends decide to revisit from their past projects.