How government can improve the efficiency and effectiveness of home health

Structural and Social factors related to HIV infections risk among truck drivers in Nigeria (Not South Africa
The strategies that world governments can implement to promote home health care.- I think the scope of this topic is too wide because how many governments will I need to research to come up with my findings? Secondly, I hope you know that this is an epidemiological study and this sounds like a social science topic the way it has been structured.

I plan to do this second study in the united states where I work in the field of health care provision. so will limit it to the US government.
For these two topics what are the knowledge gap the we will be filling?