Try to memorise the book of Allah.
A Shaykh once mentioned that a man would pray 10 juz in his qiyaam ul layl just to help him revise his Qur’an.
A Shaykh in Egypt finished the Qur’an in eight months. If you recite from anywhere in the Qur’an, he can carry on from that Verse!
A man started memorising the Qur’an when he was in his fifties, He memorised a few Aayahs a day and when he reached his late 70s/80s, he had memorised the entire Qur’an!
A blind Shaykh was on a journey and the people didn’t have a watch so couldn’t tell the time. The blind Shaykh told them the time. They enquired as to how he knew and he replied that they left at this time and it takes him 15 minutes to recite one juz from his memory and that he had already completed a few juz.
Memorising is not hard, it just takes discipline and sincerity.