I'd agree with all those.....qualified immunity is a biggie. If we are all allegedly equal under law, a peace officer should be held to nearly the same standard as I would be as a civilian to use deadly force or to be held liable for my mistakes.
I think another thing that would be helpful is body cams and felony charges for any tampering with that video.
There's a lot of layers to this onion. We need to look at recidivism and rehab, right restoration, policing for profit, civil forfeiture, RICO statutes, etc....so much of this has been intertwined over 5+ decades and it's going to take a lot to unwind the damage done.