You can downgrade the macOS Mojave beta to macOS High Sierra easily if you need to go back to a stable version on your Mac. If you are tired of testing the macOS 10.14 beta and you want to go back to macOS 10.13.5 to get away from macOS Mojave beta problems, this is that you need to do.
Going back to macOS High Sierra is an easy process, but it is time consuming, so make sure you set aside enough time to complete the process. During parts of this you will not be able to use your computer, so plan ahead.
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https://www.gottabemobile.com/how-to-downgrade-macos-mojave-beta-to-macos-high-sierra/
