Oh, I see you have this thread here too.
I had answered the other one.
Will give it a go here too.
You could describe a day in your life. Or describe in detail what something, for example, doing grocery shopping, means to you. Or take something else that is challenging for you, and try to describe it in detail. Telling how this is an example of how autism affects you. And that it may affect someone else on the spectrum in a very different way.
Or tell them what you see/hear/smell/perceive when waiting in a queue. Or about an obsession, why it intrigues you so much, what you experience when absorbed in it.
There are so many possibilities.