It is complicated. The reason crime had dropped so much is because Bill Clinton and Joe Biden passed a crime bill and locked up repeat offenders. Trump actually used that against Biden, since part of the bill indirectly discriminated against black men ...
Of course the Clinton crime bill did not really solve crime. It swept it under the rug and helped the for profit corrections industry. Still, the men who had been committing most of crimes had been swept off the streets and began making license plates, picking cotton, and so on and so forth. The corrupt prisons also became overcrowded.
Due to the pandemic, it became necessary to reduce overcrowding by paroling prisoners, most likely without well funded alternative rehabilitation programs. I have to think this might have contributed to the spike in violent crime.
I am not suggesting labeling people criminals and locking them up. There are crime prevention and rehabilitation programs that work, but only if implemented.
Just defunding /downsizing police and replacing them with nothing or releasing unrepentant convicts to offend again is not a plan