Does a Muslim receive the reward mentioned in the Hadith when increasing the number of this remembrance beyond ten times, or must one adhere to the mentioned number, and what is the meaning of his saying: "and he did not commit a sin on that day that would overcome them"?

It is permissible to exceed the number mentioned in the adhkar (remembrances). The number is mentioned so that the one performing the dhikr does not fall short of it, not to prevent him from exceeding it. By doing so, the mentioned reward and more will be obtained. The door to unrestricted adhkar is open, and the remembrance of Allah is among the greatest acts of devotion, as Allah the Almighty says: "Remember Allah with much remembrance" (33:41) and "So remember Me; I will remember you" (2:152), and as the Prophet, peace and blessings be upon him, said: "Let your tongue be moist with the remembrance of Allah."