Screen readers don't see page content (v4)

I need to create an app that would be usable for blind people but it looks like the screee reader (TalkBack) is not correctly retrieving the content of the pages, I think because they are completely loaded after the screen reader reads it. In particular when I change page I don’t get the content of the page to be read, only the title…
Do you have experience with making your app more accessible? How do you deal with it?

Any suggestions are pretty much appreciated thanks.