Why is doing small things well the most effective way to boost self-confidence? Because true confidence has never been gained through illusions, but through repeated "I did it" moments. Many people always think that confidence appears suddenly one day, but that's not true. The essence of confidence is trusting yourself. And this trust can only be built through concrete actions.

You woke up early today and completed your tasks; you stuck to exercising for a week and finished; you learned a new skill and accomplished it. Every time you complete something, it gradually creates a feeling inside: "I can do this." This feeling is the real, stable source of strength.
On the other hand, someone who only fantasizes for a long time but never takes action will feel increasingly hollow inside. Because the brain knows you haven't truly solved the problem. So often, it's not that you're not good enough, but that you're missing the accumulation of "completing small tasks."
Truly impressive people don't suddenly become stronger; they build a strong core gradually by doing well on each small task.