Smartest person in the room is fine
It's fine to be the smartest person in the room. Just never be in a room of people you can't learn anything from.
You can learn something from everybody. So if you think you're in a room of people you can't learn from, the problem is you.
I was in an Uber and the driver said to me, "As an employee, you treat your company the way they treat you." Super insightful.
There are learnings everywhere.