Install bollards in the yard in the path of the cars. These are vertical steel pipes set in concrete and filled with concrete. Paint them bright yellow. Correctly installed, they will stop a car with a big crunch. Probably cheaper than rebuilding a house wall again.

The link above is from a local reporter about this location. They literally just fixed this very wall not just 3 months ago. The insurance company had to come out and redo their work because while they had been working on it another car hit the same wall and destroyed their prior work. That was back in December.

This was last night and I believe the 5th time its been hit, Though I've been told its been hit more times than that from before I moved in too. Thank you super bowl drunk driver.

https://photos.app.goo.gl/jxWeSvLtfHiwT18p6