Krishna DOES NOT NEED OUR SERVICE

Krishna is satisfied in all respects
Krishna does not need our service, but He kindly accepts it.
When Krishna asks us to surrender unto Him
"sarva-dharman parityajya
mam ekam saranam vraja" [Bhagavad Gita 18.66]
this does not mean that Krishna is lacking servants and that if we surrender He will profit
Krishna can create millions of servants by His mere desire
So that is not the point!
However, if we surrender to Krishna, we shall be saved.
As Krishna says :
"aham tvam sarva-papebhyo
moksayisyami ma sucah"
I shall free you from all sinful reactions.
[Bhagavad gita 18.66]
We are suffering here in this material world without any shelter.
We even see many people loitering in the street, with no aim in life, confused and not knowing what to do.
But when we take shelter of Krishna, then we shall know
"Oh , now i have found shelter"
There will be no more confusion or hopelessness.
Therefore, the pupose of Krishna descending is not to collect some servants
Rather He descended (or send His messenger) for our benefit.
-Srila Prabhupada (edited)