Usage patterns
〈事〉の積み重ねan accumulation of X (effort, experience, etc.)
Success is the result of an accumulation of small efforts.
積み重ねがものを言うthe accumulation of experience/effort is what really counts
In sports, it's the day-to-day accumulation of practice that really counts.
地道な積み重ねsteady, unglamorous accumulation (of effort)
Steady, patient accumulation of effort leads to real skill.