I think the Air Force needs to go up to space and let the ground guys take over the aerial missions needed to directly support the troops.
Air superiority (including counter-air missions against enemy airfields), space control (both offensive and defensive), ICBMs, air transport, and electronic warfare should be the Air Force missions. Missions that are directly in support of ground forces should be controlled by those services with either helicopters or UAVs.
Science fiction calls space assets "ships" but there is no reason we must have a space navy in the future. Aim high, Air Force. Space Force has a nice ring, too.
Aim high, Air Force. There's a mission waiting for someone and if you don't take it, you'll lose that even as you fail to hang on to more traditional missions migrating to other services.
