Physical pomodoro: <https://upload.wikimedia.org/wikipedia/commons/3/34/Il_pomod...>
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If you find yourself programming an eInk display and a microchip in order to improve your procrastination, it is time to stop working on the project, get a physical timer, and work on the thing.
If you feel inclined to shop around for a timer before getting to work, I'll save you the search. These work great. https://www.amazon.com/dp/B07TLC9SFZ (but any timer will do).
Go do the thing. You're worth it.
I'm gonna go on a whim and say the habit doesn't last cause you cannot truly depend on them. My watch never leaves my wrist, it never fails me, it is just a "dumb" one.