Hello
I understand your concern for your child
According to the history you have provided your son doesn’t seem to have features of autism, and other aspects of milestones are normal
Yes it’s true that screen time adversely affects development of child. For less than 2year old no screen time, and 2-5 year old only 1 hour screen time per day is allowed, that too for video call/socialisation purpose only
For language delay, first we need to rule out hearing issues, then find other causes
Hoping that he didn’t have any issues during birth or later, he should be improving with speech therapy alone
Next Steps
Get hearing evaluation done
Then consult nearest Pediatrician for detailed evaluation