If you are looking for happiness, then first look for tranquility and psychological calm, this will only be achieved by believing in Allah Almighty.

Allah said ( interpretation of the meaning ) : { It is He who sent down tranquillity into the hearts of the believers that they would increase in faith along with their [present] faith. And to Allah belong the soldiers of the heavens and the earth, and ever is Allah Knowing and Wise. } Quran ( 48 : 4 )