Clear more traffic through your airspace. If you have a reputation of telling traffic to remain clear, they will go round the airspace, increasing the chance of a bust.
Provide more radar services so you can proactively manage traffic close to your airspace and make sure pilots know they can get it.
Charts. They are just an OS road map with some aviation stuff overlaid. Cluttered with detail that is of no use, for instance don't need every country lane on a VFR chart. Put only relevant info on charts and should make it easier to visually navigate around airspace.
Airspace. Not designed with VFR traffic in mind. Boundaries of any airspace at an airport with a VOR on or near it should be based upon clearly visible surface features, DME arcs, or VOR radials.
Then I guess some pilots are muppets.