The دعاء for ease is: 'Allahumma la sahla illa ma ja'altahu sahlan, wa Anta taj'alul-hazna idha shi'ta sahla' — O Allah, nothing is easy except what You make easy, and You can make grief easy if You will. هذا الدعاء acknowledges that all ease comes from Allah alone.
اللَّهُمَّ لَا سَهْلَ إِلَّا مَا جَعَلْتَهُ سَهْلًا، وَأَنْتَ تَجْعَلُ الْحَزْنَ إِذَا شِئْتَ سَهْلًا
Allahumma la sahla illa ma ja'altahu sahlan, wa Anta taj'alul-hazna idha shi'ta sahla.
Meaning: O Allah, nothing is easy except what You make easy, and You can make grief (or difficulty) easy if You will.
Source: Sunan Ibn Hibban #974هذا الدعاء embodies complete tawakkul (reliance on Allah), acknowledging that no task — no matter how small — is easy unless Allah makes it so. Conversely, no hardship — no matter how great — is beyond Allah's ability to transform into ease. It resets one's perspective from despair to hope, from self-reliance to reliance on the Almighty.
اللَّهُمَّ لَا سَهْلَ إِلَّا مَا جَعَلْتَهُ سَهْلًا، وَأَنْتَ تَجْعَلُ الْحَزْنَ إِذَا شِئْتَ سَهْلًا
The Prophet (peace be upon him) said: 'Allahumma la sahla illa ma ja'altahu sahlan, wa Anta taj'alul-hazna idha shi'ta sahla.'