The following article makes a pretty convincing case that eliminating tracking hurt high-potential URM the most. Also that quality free test-prep should be available to all regardless of SES:
https://quillette.com/2019/04/03/what-new-yorks-public-schools-could-learn-from-stuyvesant/
Stuy in decades past had more URM, but then tracking was eliminated and the number of URM who went to Stuy plummeted. So if you want a more diverse Stuy, support implementing tracking in NYC public schools again.
BTW, I often find ideas of what people consider “diverse” peculiar. A college where the majority of the student body is upper-middle class or above and the vast majority are from a Judeo-Chtistian cultural background but with the “proper” racial mix is “diverse” but a HS with a mix of all different colors, creeds, cultures, races, religions . . . is not?
Would Stuy be considered more diverse if “Asia” was split in to NE Asia, SE Asia, South Asia, and the Middle East?