Once your initial ideas have stopped flowing, you can unlock another level of ideation by adding a few product constraints of your own. Yes adding.
Add some "What if...?" questions to your ideation board using design nice-to-haves that you've identified along the way.
What if it only required one hand to use?
What if it was made from a single part?
What if it was super easy to clean?
"What if...?" questions pull your thinking to a place where novel ideas live.