Who does the urging to repent and seek salvation? Since hhere is none who understands;
There is none who seeks after God.They have all turned aside.
You are taking this passage out of context, so the meaning gets distorted. It is a reference to those who reject God. It does not mean that everyone HAS to reject God. We are all called to repent and seek salvation, and we are all given the grace to do so.
Rom 3:11-12
11 there is no one who has understanding,
there is no one who seeks God.
12 All have turned aside, together they have become worthless;
Paul is making the point that Jews are no better off than Gentiles. If they are faithless Jews, they reject God.
If you look at the verses after this one in the Psalm:
Ps 5:9-6:1
9 For there is no truth in their mouths;
their hearts are destruction;
their throats are open graves;
they flatter with their tongues.
10 Make them bear their guilt, O God;
let them fall by their own counsels;
because of their many transgressions cast them out,
for they have rebelled against you.
11 **But let all who take refuge in you rejoice;
let them ever sing for joy.
Spread your protection over them,
so that those who love your name may exult in you.
12 For you bless the righteous, O LORD;
you cover them with favor as with a shield. **
It is clear that there are righteous, those that bless His name, and He covers them with favor as with a shield.