You could read all the time management books in the world and all that knowledge and effort would simply be rendered null and void in the face of more Keflings action. Adding insult to injury, A World of Keflings will be getting 'It Came From Outer Space' DLC on Xbox Live Arcade, which will add an alien-themed kingdom to the game.
From the sounds of it we'll be getting an entirely new environment thanks with a new economy and new buildings that come with it, effectively costing you yet another 4-8 hours of your life. Bring it! There's no mention of a release date and price as yet, but the DLC will be released "in the coming weeks."
If you can't wait for that and already played Kingdoms of Keflings and A World of Keflings to death, you could always give Akimi Village on PSN a try -- it's basically the same thing by the same devs, just with a non-Keflings name.