Ming from Agents of Speech argues parents are better speech therapists than professionals because they can follow their child's interests all day. There's no magic pill. Language develops through repeated, interest-driven interactions where you describe what they're doing instead of prompting them to speak.
Chapters
Parents are looking for a magic pill. There isn't one on the Internet, there isn't one offline that what you got to understand is how do I get someone to do what I want them to do? The only way is to make them enjoy the process. Therapists online always talk about following child's lead. And don't prompt language, just describe it. It's because that's the easiest thing that you can do. There's loads of studies that if you keep on doing this over and over again, someone's language will develop. Always lead with play. There are loads of successful stories and they have a common thread to it. And the common thread is that the mom or the dad has now evolved into a better therapist. To speak at home is able to gauge the child's interest whether it's with rewards, whether it's with play, whether it's with a physical social activity. Whenever you can gauge a child's interest is where you can insert language. Right. And whenever you can get someone interested.