To come up with a few good ideas, you need to generate a lot of bad ones. And to give your good ideas a chance of reaching their full potential, you need to do some serious pruning. But don't just get rid of the bad ideas; kill some good ones as well.
Focusing on many ideas requires thinly spreading your resources. For your truly good ideas to make it to market, they need a concentrated focus and the resources to develop them fully. Make the tough choices and pull the plug on good ideas that aren't quite good enough.