Check out The Walkable City by Jeff Speck or Suburban Nation. I believe both of those books touch on the lack of use of parking spaces. Especially with city codes requiring a certain number of spaces for businesses or residential structures even when said spaces aren't necessary.

You can reduce spots/meters and raise prices and that should solve a lot of the problem. It'll also increase walking/biking/ride sharing.

Also please keep in mind I'm just trying to be constructive with some thoughts I have and books I've read, and not trying to be argumentative.