The jailbreak from PsychoTea, Siguza, & others is 'pre-release' status. As with most recent jailbreaks, the Meridian IPA needs to be installed on your device using Cydia Impactor. If you reboot, you'll need to run the app again to get your jailbreak back.
If you're still on iOS 10.x, you may want to give the jailbreak a try. You can download Meridian from the link below and check out its GitHub here.
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