Something that I try to do when I feel like there is too much stuff in my spaces, there are words or lists on a planner page, or there are just ideas in my head, I stop and identify what it is that's causing this feeling of "too much".
In a physical area, I look around and assess what's taking up space and then ask myself:
On my planner page, if my list looks out of control, I take a moment to:
Ideas that take a lot of mental energy and cognitive capacity end up on a chart paper or in the back of my planner to be reviewed later.
The idea here is that there is always something you can do when there is too much "something" in your spaces. Start by thinking about what your "too much" is, and then choose your action to begin the process of getting your spaces sorted out.