Gurudev, which ministry or administrative area would you recommend the government to take up first?
If there is a shortage of water in a state or province, then water supply becomes the chief priority for them. If there are no roads in a particular place, then good roads become their top priority. If there are no schools in a particular rural area, then primary education will be their foremost cause of concern. So it will vary.
It will be unfair to name one particular issue as a priority for the entire country.