No ideas
One excuse people often have for not contributing (to meetings, to brainstorms, to conversations of all kinds) is that they don’t have any ideas.
Of course, it’s not that they’ve run out of ideas. It’s that they feel that the ones they have aren’t very good.
And there lies the solution: because not every idea can be a good one. (That’s what makes them so unique.)
And so the way to find a good one isn’t to pray on it happening. Or hope by some measure it’ll strike you in a flash.
No, the way to have a good idea is to have no shortage of bad ones. And to recognize when you’ve got a good one when you do.