Can I use "become" instead of "be"?
If you used "become" here, it would change the meaning. This is because the word "be" describes a state of something that remains unchanged, while "become" describes a change in the state of something. In the video, he wants to emphasize that the eight traits of successful people are always the same, so he uses the word "be" to show that they remain unchanged. So using "become" instead of "be" in this situation would change the meaning.