I can’t understand why it truncates my content

I've tried making a variety of edits but it never writes the whole article for me! Could someone give me some info? It also doesn't always do everything I tell it (customizing prompt) I tell it to add "key concepts" in bold, sometimes it does and other times it doesn't, also it should always set me H1 as the title and same thing here too sometimes it does and sometimes it doesn't, same thing goes for internal links. Would anyone be able to help me to have a chance to be able to fix it? I attach in this post an image....