Autistic or non autistic. I help him?

My 3 .5Y/M son, who wasn't speaking and reacting to his name during first 2.5years of his life, he was very much engaged with mobile and rhymes. We 100% stopped his screen time and started talking to him, within 1 year he has started expressing in words what he wants what he wants to eat and what he wants to do in a small sentences, he has also started to understand our commands and acts accordingly also responds properly to his name and knows everyones name also names which he listens only once he also remembers them. My concern is he is not communicating I mean if I say "Aap kese ho ? He's blank but when I say bolo" Main accha hun" so he repeats after me. I want to know if he's autistic? If yes than at what level ? And how can I help him ? Please provide detailed answer and respected doctor please don't force to contact or come in clinic. Thank you!!