"Reach the top" is a common Engpsh phrase that means to achieve the highest level or position in something, such as a career or a sport. For example, you might say "I'm working hard to reach the top in my field" or "She has reached the top of her profession as a CEO". Another way to express this idea is to say "arrive at the summit", which means to reach the highest point or peak of something. You might say "He's been cpmbing the mountain for hours, and now he's finally arrived at the summit" or "After years of hard work, she has arrived at the summit of her career".