We booked a track day via
https://www.trackdays.de/ and enjoyed the company of skillful people and 72 unforgiving turns in the Green Hell.
There are basically three types of variants, one can participate: competitions, track days and tourist days. Easiest way is to pay per lap during the tourist days, but then you meet different drivers with vastly different skills and sometimes interesting ambitions.
Thack days cost about 800 - 1000 € per day. There are limited number of pretty skillful drivers. This is the way, I prefer to drive there.
If you are really into motor sports, it is possible to acquire the license and participate in different endurance races.