Ending the use of private prisons and restricting police use of military equipment and weapons are also frequently suggested proposals.
In terms of police violence, I think the main thing lacking right now is accountability. There are a lot of ways to impose that. One avenue is to impose accountability from a higher level of government (for instance: the FBI getting involved if local government doesn't act), and the other traditional approach is accountability from voters.
We have 10x more incarcerated per capital than germany. If the police think 1 in 100 (rounding a bit) belong in jail, it leads to a very different quality of interaction if it is 1 in 1,000.
Definitely agree on the issues with accountability.
https://en.wikipedia.org/wiki/Campaign_Zero
https://www.joincampaignzero.org/s/CampaignZero-Policing.pdf
They seem like sensible policy positions for reducing violence and misconduct by police.