You don't HAVE to build just because there is a contest right now. I got builder's block back in late August/early September. I haven't really "built" anything since then. I've customized some minifigs, but haven't built an actual structure. And honestly, i'm perfectly content with that. I'm not going to force myself to build when I don't want to.
When the inspiration comes back, i'll start building again. Maybe this is a sign you need a slight break from the hobby
Because if you're building something just so it can be entered into a contest, and you have no inspiration, your builds probably aren't going to turn out as well as you would like them.
This, of course, is just my humble 2 cents.