The fix for "failed to quiet devices" in your 2017 MacBook Pro 15-in was included in the version of Mojave you are running, 10.14.6 with supplemental updates to build number 18G95.
Either your updates did not proceed normally and some part of MacOS was damaged during the update, or you have different Hardware problem not covered by the software update.
To make progress, you need a Trusted Backup.
¿What is the Date&Time of your most recent backup, and by what method?
If you have the slightest doubts about it, you should make another backup, preferably by a different method.
Completely Re-Install MacOS:
Once you have complete confidence in your Backup, boot to Internet Recovery or a bootable Installer/Utilities USB stick, launch Disk Utility, set to Device View, and completely erase your drive, by immutable Hardware-name.
Then re-install MacOS.