Unfortunately if you want to have a lawn space free of crabgrass, it will take some work. 

At this point in the year the crabgrass is going to die soon as it is a warm season annual.

It is too late in the year for any cover crop seed to be able to germinate and successfully grow. If you wanted to in the spring, you could aerate and overseed or till your yard to break up the compacted soil and overseed then or to combat the crabgrass it may be easier to use sod as it will take faster than seed (this will come with a higher price tag though). We wouldn't recommend red clover. If you wanted a turf type lawn you could mix tall fescue with microclover as an option. For lawn care guidance or rehab you can look through our Lawn Care and Maintenance pages.

To reduce maintenance you could consider reducing lawn space by planting native plant areas. Once established, these would be lower maintenance.  You can review our web resources for lawn alternatives for some options and ideas. 

Once you review these resources, feel free to reach out with further questions. 

Emily