Cydia mostly only exists for devices before the iPhone X that are susceptible to the Checkra1n USB exploit. Past that, jailbreaks are few and far between, with

Cydia mostly only exists for devices before the iPhone X that are susceptible to the Checkra1n USB exploit. Past that, jailbreaks are few and far between, with the latest A12+ jailbreak being Dopamine for iOS 15 - 15.4.1, and that was only released in May of this year. There is no iOS 16 jailbreak except for on those iPhone X or earlier devices.