I can spill extensive digital ink on worldbuilding that is almost entirely divorced from my main story, but writing an actual update for that story feels like pulling teeth.
Make it make sense.
Sometimes I feel like I am writing only the highest-class classical literature of magical girl stories. Other times I feel like I am writing the equivalent of My Immortal.
Something I'm trying is just x number of words a day. To build a writing habit/practice and to flesh stuff out so that I know what I need to build in the preceding scenes.