How to write a good prompt for a long long content

Greetings! every one.
I got a question if I want to put a long article to GOT and I am hoping for a good result.
Then what should I do for prompt? Like if I wanna check all the facturals in the article or find the assumptions made in the article.

I tried to use two system messages before and after the content.
Sometimes it works, but sometimes not.

Have you tried the best practices? If not check out this article: https://platform.openai.com/docs/guides/prompt-engineering/six-strategies-for-getting-better-results

You can try this approach:
First, ask GPT to read the long article and then inquire, “What is this article about?”
Next, open a new chat, paste the long article there, and then paste the summary that was just generated at the bottom. Finally, issue your desired command. The structure should look something like this:

The Article

{ your long article }

What I Want You to Do

The above is an article about { the summary }
Please report all the factuals in the article.

If GPT is unable to identify factuals not mentioned in the summary, you can add an additional sentence at the end:
Please state clearly what’s included in the summary and what’s not.