Why not try a track day sometime? It was after I bought my Miata in 1998 that I took my first one-day High Performance Drivers Ed (HPDE) class, setting me off on my major hobby for the next 12+ years.
There are many great tracks in California, including Willow Springs and Button willow in Southern California, and Sonoma and the great Laguna Seca in Northern California. One of my great regrets is that I never got to drive Laguna Seca.
If you’re at all interested, go to the websites of the tracks, look at their calendars for car club events. You can’t race with your street legal Miata, but most events will probably be non-racing HPDE. And you can probably join in a non-Miata club event with Porsches or other makes. They usually aren’t exclusive.
The track itself might also offer track days with instruction. Even a one-day class will make you a better driver on the street. Or you might get hooked, like I did. Then you’ll want those summer tires to start, and may work up to track-only racing slicks. And performance mods to the car, and a dedicated track car, and…