Can you help me to improve my pronunciation?

Write down what you hear.

Sit down and listen. Listen to someone speak and write down what they are saying. You might be thinking, “Hey, I’m here to practice English speaking, not listening!” However, listening is an excellent way to improve English pronunciation.

How do you say beautiful in American accent?

Is it pronounce or Pronunciate?

The correct verb in English is pronounce, not pronunciate. An articulate and well-educated fluent English speaker who used pronunciate as a verb might be assumed to be making a joke.