Final answer:
The incorrect pronoun shift in the sentence is between 'you' and 'a salesperson'. To correct it, use 'a person' instead of 'you'.
Step-by-step explanation:
The incorrect pronoun shift in the sentence is:
If you are willing to work hard, a salesperson can make a lot of money here.
The pronoun shift occurs between 'you' and 'a salesperson'. To correct the sentence, it should be rewritten as:
If a person is willing to work hard, they can make a lot of money here.