Can you please give a practical and guaranteed method by which one can get the absolute Pinnacle, top of the top place and rank in heaven.

I know the regular humans cannot reach the rank of Imams and Prophets but what can we do to reach the absolute highest position possible for us regular humans?

Is it to memorize entire Quran? Because all levels of Jannah are like verses in Quran?

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Follow the life of the prophet and the Ahlulbayt. Try to emulate them. One part of it is Quran but there are many other parts.