How can one mend the heart and return to a state of reverence and devotion to obedience after feeling a setback and a decrease in faith, despite maintaining prayer and memorizing the Quran, and with the presence of divine whispers?

Continue to do good deeds, observe the obligatory acts, and perform many supererogatory acts, so that you may attain the love of Allah the Almighty, as stated in the Hadith Qudsi: "My servant continues to draw near to Me with supererogatory acts until I love him..." Increase your supererogatory prayers, fasting, charity, remembrance (dhikr), and supplication (du'a). Do not let the whispers of Satan and the thoughts he casts into your heart preoccupy you. Strive against Satan and exert yourself in obedience, and do not pay attention to those whispers. Accompany the righteous women, and repent if you sin. Continue in obedience and do not care about the whispers of Satan, and strive in supplication, for it is one of the greatest weapons.