I have found an excellent resource [1] for data-driven policy that has been shown to reduce racism and abuse in police departments. I have written all of my local leaders who are up for election where they stand on each one of their ten points.
All of the requests on their website seem reasonable and it was really illuminating doing research on my local police force and seeing how few of them they've enacted.
[1] https://www.joincampaignzero.org/