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1. Because Allaah commanded us to ask Him
وَقَالَ رَبُّكُمُ ٱدْعُونِىٓ أَسْتَجِبْ لَكُمْ ۚ إِنَّ ٱلَّذِينَ يَسْتَكْبِرُونَ عَنْ عِبَادَتِى سَيَدْخُلُونَ جَهَنَّمَ دَاخِرِينَ ٦٠
And your Lord says, "Call upon Me; I will respond to you." Indeed, those who disdain My worship will enter Hell [rendered] contemptible.
(Surah Ghafir 40:60)
2. Du'aa is worship
The Prophet ﷺ said:
الدُّعَاءُ هُوَ الْعِبَادَةُ
"Du'aa is worship."
(Sunan al-Tirmidhi, authentic)
Every sincere du'aa is an act of worship, even before it is answered.
3. It shows our poverty and Allaah's richness
Allaah says:
۞ يَـٰٓأَيُّهَا ٱلنَّاسُ أَنتُمُ ٱلْفُقَرَآءُ إِلَى ٱللَّهِ ۖ وَٱللَّهُ هُوَ ٱلْغَنِىُّ ٱلْحَمِيدُ ١٥
O mankind, you are those in need of Allāh, while Allāh is the Free of need, the Praiseworthy.
(Surah Fatir 35:15)
Every du'aa is a declaration: "O Allaah, I cannot do this without You."