tutor for autistic kids

im looking to find a tutor that specializes or has experience with tutoring autistic children. my nephew is 5 years old and has level two autism. he has a speech delay but he’s learning so many new words and forming longer sentences. i’m hoping to find him a tutor that can help him reinforce what he’s learning in school. he knows all his letters, numbers, colors, shapes but we’re having trouble sitting him down and following work instructions. any leads would be appreciated. thanks!