The Day of Arafah is the most significant day of the Islamic year and the pinnacle of Haji. Nabi (shallallahu alaihi wa sallam) said: 'The best doa is the doa on the Day of Arafah, and the best thing that I and the prophets before me said is: La ilaha illallahu wahdahu la sharika lah, lahul-mulku wa lahul-hamdu wa huwa ala kulli shay'in qadir.' This dhikr should be repeated abundantly throughout the day.
Beyond this specific dhikr, the Day of Arafah is the time for the most personal, heartfelt, and urgent doa-doa. Ask Allah for everything — forgiveness, guidance, health, provision, protection of your family, success in this life and the next. There are no required set doa-doa for Arafah; the most powerful shalat come from a sincere and broken heart. Make doa in your own language so you can express yourself deeply. Cry if you can — Nabi (shallallahu alaihi wa sallam) said that Allah descends to the lowest heaven on this day and boasts to the angels about the jamaah haji.
Practical tips for maximizing your Arafah experience: after combining Dhuhr and Asr shalat, spend the entire afternoon until sunset in continuous worship. Alternate between doa, dhikr, Al-Quran recitation, istighfar (seeking forgiveness), and salawat (blessings upon Nabi). Face the Qiblah and raise your hands when making doa. Prepare a written list of doa-doa before the day so you do not forget anything important. Stay hydrated and in shade to maintain your energy for this marathon of worship.