The antonyms for "crazy shtick" would be normal, conventional, typical, ordinary, and usual. While "crazy shtick" suggests something outlandish or outside of the norm, these antonyms emphasize the expected or conventional. Instead of relying on wild and unconventional behavior, an individual who embraces these opposite qualities may prioritize stability and predictability. It's worth noting that just because someone does not engage in "crazy shtick" does not mean they are boring or unremarkable; there are plenty of unique and interesting individuals who express themselves in more conventional ways.