Why do I not feel happy despite having all the ingredients for happiness?

Your question is incomplete, and what can be said in response to it is that supplication is the best way to salvation. Therefore, I advise you to continue supplicating with humility, devotion, and good assumptions about Allah. He has commanded supplication and promised a response, as He says in the Qur'an: (And your Lord says, "Call upon Me; I will respond to you." Indeed, those who disdain My worship will enter Hell [rendered] contemptible) [Ghafir: 60].

If there are ordinary causes, strive to remove them. If you strongly suspect there are extraordinary causes, then be diligent in performing Ruqyah (Islamic exorcism), reciting the Qur'an, especially Surat Al-Baqarah, and maintaining the morning and evening remembrances (adhkar). Be keen on faith and righteous deeds, for they are among the greatest causes of happiness. If you are not married, strive to find a righteous husband who will assist you in your life. Seek righteous friends who will be a support for you in your life.