If you're expecting to have a brilliant idea every single day, then you're in for a let down. They more so come in tiny bursts.
What counts is not that you have a brilliant idea every day, but what you do in between the brilliant ideas to make sure that they come.
Brilliance doesn't have an on off switch. It's more like boiling a pot a water. You have to turn on the element and wait for the pot to boil.
It's like lighting the fuse of a firework. You have to light the fuse and let it burn a bit before the brilliance shows up.