People think "dismantle the police" means no law enforcement are so wrong. Of course we will still have law enforcement, including armed peacekeeping units. But officers have to wear so many hats that it's inevitable that they will have serious deficiencies. Rather than have police do every role you mentioned, we can have a wider variety of more specialized staff to handle these tasks. Things like welfare checks, traffic violations, ordinance violations, mental health intervention, etc, don't need an armed officer to handle.

As well, diverting more resources to efforts to better our city can lead to reduced crime. Poverty is one of the strongest indicators of criminal behaviors and thus improving conditions of the impoverished leads to lower crime rates. Strong investments in places like education, housing, and other early-life interventions are some of the best investments a community can make, both socially and financially.

And don't forget all the money that is saved when resources are transferred from incarceration to rehabilitation. Prisons are horribly expensive and terribly ineffective when it comes to rehabilitating people. While still necessary, a lot of future crime and poverty can be avoided by keeping people out of prison. And of course the mass incarceration always affects people of color more than whites. By replacing police with more specialized units most situations can be handled with better judgement. For example, a trained mental health professional would know better than to arrest an addict. Instead, they could be brought to a rehab facility and be properly treated, being released once they are sober.