Every tool you tried was solving the wrong problem.
To-do lists are a record of what hasn't happened yet. Google Calendar maps your obligations. The Pomodoro timer measures how many intervals you survived. They all point forward — at the gap between you and done.
None of them asked you what you intended before you began. None of them helped you reflect with compassion on what actually got in the way. None of them handed you documented proof, at the end of each day, that you showed up.
The answer: you were trying to fix a thinking problem with a logistical solution.
The problem was never discipline. The problem was that every solution you tried was designed for a scheduling challenge you were not actually facing. You were asking something deeper: Am I capable of living the life I've been promising myself?
The answer is yes. It always was. You simply needed the right mirror.