Infinitely Sharp Personality Master

When the protagonist Mei Yingxiong undergoes a mental examination, he unexpectedly discovers that he has a system in his body that can change his personality at will. He can choose a master-level personality in various fields at will, and he has since reached the pinnacle of life in all walks of life. Want to play ball? Use the lineups of past NBA Dream Teams at will; Want to sing? Is Elvis Presley's level enough? Want to film? Please stand up which personality is the best actor; Want to write a book? I don't know if a remake of "The Lord of the Rings" is to your liking; Want to beat someone up? Tyson, come here... Although there are many benefits, each personality has its own small problems, and the cost of using personality is a bit high...