I would ask your pediatrician or other parents for recommendations. I’ve also found the Find a Therapist tool on Psychology Today to be really helpful because you can search by speciality and location.
There are some therapists on ADDitude’s Directory too:
https://directory.additudemag.com/
Penny
ADDitude Community Moderator, Parenting ADHD Coach, Podcaster & Author, Mom to teen w/ ADHD, LDs, and autism