Here is the dua that removes every hardship and is answered by Allah (swt) if made sincerely by the believer.

Sheikh Omar Suleiman shares and reflects on a beautiful du’a stated by Prophet Yunus (Jonah) as he was in the belly of the whale.

لَآ إِلٰهَ إِلَّآ أَنْتَ سُبْحَانَكَ إِنِّيْ كُنْتُ مِنَ الظَّالِمِيْنَ

la ilaha illa anta subhanaka inneekuntu mina aththalimeen

And he called out within the darknesses, “There is no deity except You; exalted are You. Indeed, I have been of the wrongdoers.”
[Surat Al-Anbiya: 87]