Of course they would think that, it has been over a year now since the last update.
They only thing I can do to prove that I'm working on it is to publish a new chapter. No point in making any announcements or teasers or WIP shots or anything. An actual update is what people will want by now- nothing else.
I'm not going to say much about plans or anything until I've got a chapter out. If I can write a new chapter, then I can write the rest of the story.