Allāh ﷻ says in the Qur’ān that He ﷻ opens the hearts, of those for whom He ﷻ wants happiness, to Islām. People think that having more things will bring happiness but it only leads to misery and sadness. Allāh ﷻ is our Creator, He ﷻ knows best. Happiness is with Him ﷻ.