In need of direction!

With publication of one book imminent, Iwant to get writing again but I'm not sure which direction to take - and so I'm dithering and doing nothing! If The Keystone takes off I need to reread/rewrite the sequel I've already written. While I could leave my Athlandia series at #3, Love and Restitution, I have written a possible #4 and half written a #5. I also have 2 completely different adult stories running around my head; should I concentrate on these, hoping for success?