One of the best things I ever did for my productivity was to re-think the way I manage my daily schedule, especially when it comes to meetings. Prior to that, I never had any meaningful time for deep work that required intense thought.
Now, a few years on, my colleagues suspect I figured out a magic formula that adds extra hours to the day. In reality, it's more alchemy than sorcery, like turning lead (a calendar overrun with meetings) into gold (a schedule neatly organized into blocks).