ADHD-PI here. I use a version of Pomodoro technique with adaptations inspired by Leadership is Language by David Marquet and by what Prof. Andrew Huberman says about Dopamine.
Blue: Come up with my intended outcome. Set a duration from 10 to 45 minutes in proportion to my intuitive confidence that I am “on the right path”.
If I am spending too long in blue, then say the thing I’m most anxious about. State a hypothesis about it and frame my intended outcome as a test of that hypothesis.
Red: Execute at speed while still noting any surprises in a notebook.
Blue: Reflect on what I’ve produced and what I’ve learned. Notice any errors I made and think (without typing) about what led to them.
Green: 2-5 minutes meditation. Reconnect with my breath and body. Control my internal sense of time pressure.
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Sidenote: I highly recommend both Leadership is Language and the Huberman Lab podcast to ADHDers and folks who just have struggles turning their intentions into action.