If you find it hard to go to the shelf and pick up the Quran at any free moment, or open it from your phone and read a few ayats, then know that you are already close to perdition.

A person should always compare Allah's mercy and virtue towards them with their own shortcomings, because such awareness of one's duty to Allah pushes a person towards righteousness.

Tafsir 59:19

Seeking Forgiveness on the Last Day of Ramadan

Ibn Rajab, may Allah have mercy on him, said:

والإستغفار ختام الأعمال الصالحة كلها فيختم به الصلاة والحج وقيام الليل ويختم به المجالس فإن كانت ذكرا كان كالطابع عليها وإن كانت لغوا كان كفارة لها فكذلك ينبغي أن تختم صيام رمضان بالاستغفار

“Istighfar (seeking forgiveness) is the culmination of all righteous deeds: it concludes prayer, pilgrimage, night prayers, and gatherings. If the gathering was in remembrance of Allah, istighfar complements it, but if it was idle talk, istighfar serves as atonement for it. Similarly, it is fitting to conclude the fast of Ramadan with istighfar.”

لطائف المعارف

Completion with istighfar is the cause for forgiveness of deficiencies and faults in fasting, as well as for the preservation and increase of reward, because a person may become self-satisfied due to their righteous deeds in this month, leading to a decrease in their reward. Istighfar, however, brings understanding of the imperfection of one’s worship and the need for Allah’s acceptance of it.