If you start to think that you are the smartest person in the room, then it’s time to move on and try new things. You are either surrounded by sycophants, or you’ve stopped learning altogether.
You are only as smart as the people you talk to. Work with people where you sometimes have to resist the urge to pick up a pen and start transcribing what they are saying because it’s so thought-provoking. Work with people who question you and push you to go beyond a simple yes or a no. Work with people who challenge your assumptions and sometimes make your brain ache. That’s learning.
Getting rid of the sycophants is a little harder because you’ll first have to deflate your ego and face up to who you are.