As part of a group of IT professionals, we all are usually on the same page when we recommend not to install the latest beta of iOS, iPad OS, or macOS. Even though it looks like everything works well, there are usually compatibility issues, constant crashing, data loss, and a plethora of other issues that crop up and can take down that mission critical system you installed said software on. If you did not heed the warnings and wanted to live on the wild side, this support article from Apple details steps on how to get back to your current, non-beta operating system (I also hope that a backup was made before you made the jump!):

iOS - https://support.apple.com/en-us/HT203282
macOS - https://beta.apple.com/sp/betaprogram/unenroll