Supplicate to Allāh ﷻ with an earnest heart. Supplications and prayers are not lip service. Duʿā refers to asking and begging with full concentration and devotion. Spare a moment from your daily 24 hour activities and then wholeheartedly pray to Allāh ﷻ with full conviction of your duʿā being accepted by Allāh ﷻ.
What can’t a duʿā do? Duʿā is a miracle which can achieve the unachievable!
[Don’t worry, Be Happy, Muftī Saiful Islām, Page 15]
In order for our duʿā to be answered, it is necessary that one appears before Allāh تعالى as weak, helpless and simply unable to hold on his own, modest and humble and submits to Allāh تعالى with total negation of what is supposed to be pride, dignity, honour, ego and then makes duʿā. Duʿā is a thing of the soul which requires that its words match the feebleness and humbleness of the soul of the maker of that duʿā.
Allāh تعالى is All-Hearing (السميع), All-Knowing (العليم). Allāh تعالى knows what we show on the outside and what we hide on the inside. Allāh تعالى hears everything said quietly or loudly.
Therefore, when the voice of the Companions رضي الله عنهم reached a loud pitch during duʿā made on the occasion of the Battle of Khaybar, the Messenger of Allāh ﷺ said, “You are not calling someone dead or absent that you say it in such a loud voice. Instead, your addressee is someone Hearing and Near, that is Allāh تعالى (so, to raise your voice is redundant).
Allāh تعالى has mentioned the duʿā of a righteous person in these words, “When he called his Lord, calling in a lowered voice..” (19:3). – The state of duʿā liked by Allāh تعالى is that it be asked of Him in a lowered and subdued voice.
[Maʿāriful Qur’ān, Volume 3, Page 691-693]