Taking notes is an excellent tool to keep the clutter out of my mind. So far, I'm still struggling to implement a process that works for me.
In mid April 2020, I discovered Roam Research as a powerful note taking tool. I try to create a daily journal page for every day in Roam where I keep as much notes as possible about my habits, todos and more or less random, noteworthy things.
I finish every day with a short review, answering a list of questions:
Did I spend most of my day in a productive way?
Did I spend money?
Did I create something?
Did I learn about anything?
Am I annoyed or upset about anything?
How would I rate this day?