The first 10 days of Dhul Hijjah are the most blessed days like the last 10 nights of Ramadan are the most blessed nights. So we should make the most of these days.
These days of Dhul Hijjah are so blessed because Allah completed the religion in these 10 days. All of the 5 pillars are present in these 10 days. Shahadah, praying, fasting, charity, and hajj which cannot be done at any other time. So we can complete all 5 pillars in these days which cannot be done at any other time of the year.

So I just wanted to share some of the things which are encouraged to do on these 10 days
Make Takbeer
Tahleel – La ilaha illallah
Takbeer – Allahu Akbar
Tasbeeh – Subhanallah
Tahmeed – Alhamdulillah
There are no days that are greater before Allah or in which good deeds are more beloved to Him, that these 10 days so recite a great deal of tahleel, takbeer, and tahmeed during them. (Ahmad)
Fasting
It is encouraged to fast the first 9 days of Dhul Hijjah and we are especially encouraged to fast on the 9th day which is the day of Arafah.
Fasting on the day of Arafah is an expiation for the preceding year and the following year. (Muslim)
Fulfil obligations
When we try to make the most of these days we need to remember that we have obligations to Allah and the people which we cannot neglect. So for example we need to make sure we perform our 5 daily prayers and fulfil our responsibilities to those who we are responsible for.
Increase in Good Deeds
We should try to increase in as many good deeds as we can during these days.
Some examples are; praying nafl prayers, increasing in how much Quran we read, giving in Sadaqah and making istigfar
There are no days in which righteous deeds are more beloved to Allah than these 10 days. (Bukhari)
Perform Hajj
This is something that not everyone can do but for those that have the means and ability it is obligatory for them to perform Hajj at least once in their lifetime.
Hajj is one of the 5 pillars of Islam so we should do our utmost best to perform hajj if we are able.
Give Qurbani
Even if we can’t perform Hajj we can still give Qurbani which is the sacrifice of an animal. Today there are many charities we can donate the money to so that the meat from the sacrificed animal will go to the poor and needy.
It is a way for us to connect to Ibrahim and reminding ourselves of the faith he had in Allah and that we should strive to build our faith and connection with Allah too.
For every hair of the Qurban you receive a reward from Allah.” (Tirmidhi)