He began with how those who consider the weak gain God's attention. I suppose "weak" can be interpreted as sick, poor or somehow challenged by the demands of society and living. He continues with seeking God to protect him against those who attack him unjustly. In his position, he was subject to envy from associates and jealousy from others.
David seems to live at the mercy of his own paranoia. That is a risk that comes to all who are in any sort of elevated position: they always have the detractors who would disable and destroy them. But David has God. In verse 13 he gives praise for God and His eternal
Psalms 42 and 43
Aaron as leaders of the Exile.
Read Psalms 42 and 43 perhaps with new insight.
The author continues to claim them to be God's people. "We had not forgotten you.," he says. Then he leaves the responsibility on God. Awake Lord! Why do you sleep? He closes with a new affirmation of their dependence on God. Rise up and help us/
Rescue us because of your undying love.(vs. 28)