Heart of Zahra

وَعَجِلْتُ إِلَيْكَ رَبِّ لِتَرْضَىٰ

You wonder if your prayers even matter. But Allah told you to say "Sami Allahu liman hameedah" right in the middle of every rakah, in every Salah.

Reserve all your prayers, supplications, solicitations for Him and Him alone. For to bestow, give, and confer lies only in His Power. Allow God to exceed your expectations and be extravagant in what you ask of Him. Ask audaciously for your heart's greatest desires, and know that how you perceive God's generosity will shape the outcome to your prayers. Indeed, only He Who is Most Generous is worthy of worship.

“Do you suppose that you will enter the Garden without encountering what those before you encountered? They were afflicted by misfortune and hardship, and they were so shaken that even [their] messenger and the believers with him cried, ‘When will God’s help arrive?’ Truly, God’s help is near.”