To Be Forgotten/Ignored By Your Rabb

And it will be said:
“This Day, We (Allah) will forget you as you forgot the Meeting of this Day of yours.
And your abode is the Fire, and there is none to help you.”
[Al-Jathiyah 45:34]

In Sahih Muslim, it is reported that Allah will ask some of His slaves on the Day of Resurrection:
“Have I not given you a spouse, honored you, and subjected the camels and horses to you?
Have I not allowed you to be a chief and a master?”
The slave will say in answer, “Yes, O Rabb!”
Allah will say, “Did you think that you would ever meet Me?”
He will say, “No.”
Allah the Exalted will say, “Then this Day, I will forget you as you forgot Me.

This because you took the revelations of Allah in mockery,
and the life of the world deceived you.
So this Day, they shall not be taken out from there (Jahannam),
nor shall they be returned to the worldly life (so that they repent to Allah).
[Al-Jathiyah 45:35]

Therefore o sons of Adam, be wise! Do not let the pleasure of this world fool you, for there will come a definite Day when no apology shall be accepted by the Rabb of all worlds. There will come a definite Day when Allah s.w.t. will forget you, as you have chosen to forget Him.
Tafsir Ibn Kathir