The Qur'an gives a direct answer to life's biggest question: people were created to worship Allah. Worship ('ibadah) is wider than ritual: honest work, kindness and caring for family all count when done for Allah. Al-Mulk adds that life and death are a test of who does best.
Adh-Dhariyat 51:56–58
Listen on Quran.comوَمَا خَلَقْتُ ٱلْجِنَّ وَٱلْإِنسَ إِلَّا لِيَعْبُدُونِ
51:56I did not create the Jinns and the human beings except for the purpose that they should worship Me.
مَآ أُرِيدُ مِنْهُم مِّن رِّزْقٍ وَمَآ أُرِيدُ أَن يُطْعِمُونِ
51:57I do not want any sustenance from them, nor do I want them to feed Me.
إِنَّ ٱللَّهَ هُوَ ٱلرَّزَّاقُ ذُو ٱلْقُوَّةِ ٱلْمَتِينُ
51:58In fact, Allah is the All-Sustainer, Possessor of power, the Strong.
Al-Mulk 67:1–2
Listen on Quran.comتَبَـٰرَكَ ٱلَّذِى بِيَدِهِ ٱلْمُلْكُ وَهُوَ عَلَىٰ كُلِّ شَىْءٍ قَدِيرٌ
67:1Glorious is the One in whose hand is the Kingdom (of the whole universe), and He is powerful over every thing,
ٱلَّذِى خَلَقَ ٱلْمَوْتَ وَٱلْحَيَوٰةَ لِيَبْلُوَكُمْ أَيُّكُمْ أَحْسَنُ عَمَلًا ۚ وَهُوَ ٱلْعَزِيزُ ٱلْغَفُورُ
67:2the One who created death and life, so that He may test you as to which of you is better in his deeds. And He is the All-Mighty, the Most-Forgiving,
English translation: Mufti Muhammad Taqi Usmani, The Meanings of the Noble Qur'an, via Quran.com. Arabic: Uthmani script.
What would 'doing your best' look like in your life this week?