Dua 52 When relief from a difficulty is attained or when we obtain something we desired, recite this dua:
(Surah Yusuf (12), Verse 101)

تَوَفَّنِي مُسْلِمًا وَأَلْحِقْنِي بِالصَّالِحِينَ

tawaffanee muslimanw wa alhiqnee bissaaliheen.

Let my death be in submission [to You], and unite me with the Righteous.

(Surah Yusuf (12), Verse 101)

Allah saved Hazrat Yusuf (A.S.) from the evil of his brothers (from their wickedness, malice, and deceit). He rescued him from the well, reunited him with his separated parents (Hazrat Yaqub A.S.), granted him the knowledge of interpreting dreams and wisdom, and bestowed authority upon him. At that time, Hazrat Yusuf (A.S.) recited this dua.
When we achieve what we desire after effort and struggle, or when we are freed from a hardship, we must recite this dua. Allah is greatly pleased by this.