How Can One Further Improve Speech Delay Progress For A Child Despite Recognizing Animals, Colors, And More?

Hi doctor. My son is speech delayed And is in speech therapy and playschool since last 4 months. Now he can tell all animals coloursfruits vegetables numbers and recite Alphabet hindi and english .but he still avoids communication and direct talk . How to improve from here .is he in right path or do we need some treatment?