As I said, I really have no idea what would work. Everybody has ideas that don't seem to get much traction.

The only thing I have seen that does work is when the race director or other person in charge actively makes new people feel welcome, and helps them have fun. It's pretty rare, since it involves a certain amount of personal charisma. The most new people at a track featured a guy like that and a sportsman or novice class that was mostly run what you brung. And if there was not enough, he would wedge you in a class somewhere, so you had a chance to race.

Trans am and USGT have made quite a few companies a lot of money. That's not the point, but you would think these guys would have a vested interest in figuring out how to get more participants instead of relying on goofs from the internet to figure it all out for them.