I use a bullet journal, the original Rider Carrol method: No advance planning, just dump your brain into ink and paper, organize what's there, index what's important so you can find it later, eliminate unfulfilled tasks that aren't as important, move important tasks to today's list.
It's not perfect but it's very resilient and works well with my brain. And if I don't use it your a day or a month or a year it still works fine when I come back, it doesn't require consistency.