It is recommended to fast on the First nine days of Dhul-Hijjah especially on the 9th, Which is the blessed day of ‘Arafah.
As H. Abu Qatadah (R.A) reported: The Messenger of Allah (pbuh) was asked about the observance of Saum (fasting) on the day of Arafah. He said, “ it is an expiation
for the sins of preceding year im, Ch: 227, Hadith no: 1250].

Therefore, we should try our utmost to fast and offer Nafl-Salah, try to offer Tahajjud/Qayam-ul-lail and spend much time in Sujood and ask for forgiveness, Recite Qur'an and try to understand as much as we can; in these blessed 9 days of Dhul-Hijjah, particularly the 9th of Dhul-Hijjah which is the day of ‘Arafah and if not, then we should at least fast as many as we can possibly can, as we may not get this opportunity again next year as life is uncertainty and we should never delay on doing good deeds.
May Allah( swt) give all of us the opportunity to gain more and more benefits from these blessed days.
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