They are asking for one or multiple of :
1. Use of lapsed green cards slots from other categories to be used for pending green cards.
2. Removal/Relaxing of the 7% rule, which uniquely inconveniences Indians. (If the idea is diversity, then in almost every way India is more diverse than arbitrarily formed culturally homogeneous tiny nations around the world.)
3. More humane work permit rules for those who have a PR in the waiting. Eg: relaxing the insane 60 day unemployment rule, reducing need to restamp visa incredibly often, allowing secondary sources of income or starting a startup.
4. More stable processing times and predictions on how long PR waiting time actually are. Current estimates vary from 20-100 years. That is simply unacceptable as a range.