The greatest gift Allāh ﷻ gave to people is Islām and īmān. If Allāh ﷻ is happy with you, that is the greatest happiness. Even if you have billions, you cannot taste the sweetness of īmān anywhere else. Some of the richest people work twenty hours a day only to make more money, but that kind of happiness comes to nothing. Raise your head and look for real happiness, the happiness that lasts forever.