Defunding the police does not mean abolishing police

Defunding the police simply means reducing funding to police and instead redirecting those funds to programs better suited to their purpose.

That's literally what "Defund the police" means

Defund the police means "reduce funding", and the people asking for it are asking that those funds be allocated to services better suited to particular needs that the police are currently being used for

There's basically no correlation between police spending and reductions in crime

https://www.washingtonpost.com/politics/2020/06/07/over-past-60-years-more-spending-police-hasnt-necessarily-meant-less-crime/