The very nature of policing needs to change.
Unarmed martial arts such as BJJ, with mandatory minimum qualifications, recertifying every few months. The ability to subdue and control an assailant, without using a weapon and without injury to the attacker, should be made a cultural point of pride among police.
Mandatory regular empathy training.
Mandatory training to quickly distinguish between real and imagined threats, and to abort quickly force escalation if a threat turns out to be imaginary.
Clear rules of engagement for use of tools like batons, Tasers, and firearms.
Detective units need punishment for declining to pursue cases when resources and evidence are available. There should never be a rape kit backlog.
Reward good behavior. Officers should be proud of statistics like "greatest % of arrests this month without injury to the suspect."
Police simply don't need to handle everything. Welfare checks, mental health emergencies, and drug emergencies need a social worker involved and on the front lines.
Policing is an extremely hard job. Police academies are not preparing officers for it correctly because police departments have no incentive to actually conduct policing correctly. It all starts with political oversight and breaking down the blue wall of silence.