Recently I have witnesses fighters that don't possess the power to keep there opponent off them and quickly succumb and get Knocked out!Any serious boxer will throw thousands of punches over his training career. A pro will throw millions. These repetitions make the neuromuscular pathways between the brain and muscles more efficient. It's these many repetitions that make throwing a fast, accurate and effective punch second nature. However, all those repetitions do virtually nothing in the ways of developing strength in the muscles.
If you want more power, you're going to have to pump some iron. Heavy iron. It's not merely hand speed or delivery technique that drops your opponent to the canvas. It's muscle power anchored on the ground by leg muscles and transmitted through the muscles of the shoulders and arms. Learn to train with weights so those muscles can deliver maximum power.