Novel juggling

I've decided to write two novels concurrently: Ante Body and a comic fantasy I've been ruminating on for a while.
I'd abandoned it because I came across a published book by someone else that already used one of the central ideas. Plus I doubted the potential of comic fantasy. Now I've accepted that the genre is closer to my natural writing voice so I'll go with how I feel (cue stirring, tacky 80's synth music). Plus, .Richard Harland is kicking butt with comic fantasy, so it can even be done in Australia.
I've found a way to toss the used idea and run with others. I'm now deep in world building, sketching out races, places, customs, cities, history, etc etc