What now?

I've been using the c25k version of Zombies Run for a while now and have started looking into what to do next. I downloaded the main Zombies Run app, but by comparison it's rubbish! There are no instructions given and no structure - I am left to rely on my own willpower and planning, which renders the app utterly useless! Does anyone have any suggestions for carrying on after c25k, without just "going for a run", which will crush my motivation entirely?