Try booting your Mac in Recovery Mode; it can finish encryption of your Mac for you. Hold down Command-R while you turn on or restart your Mac. Release the keys when the Apple logo and a progress bar appear. Plug your MacBook into power to ensure that it can resume encryption of your hard drive. When the Utilities menu appears, go to the very top of the screen and click on Utilities, then choose Terminal. Execute one of these commands:
'The best way to download Mac OS X High Sierra is via a direct link. This is primarily because Apple has hidden the installer from. The Mac App Store. This means that users that search for the installer. Will not find anything if they have a newer version of Mac OS. Download the app via a direct link and then install it. Usually, “macOS Sierra failed to download” or “An error has occurred” messages appear in the middle of the process and then the download stops. In other cases, the download might be successful, but the installation does not start. You can download the Sierra installer in the App Store by searching for “macOS”. Make sure you click “Download” and let it save to your Mac’s hard drive. While that downloads, you can move onto the next section and start getting your external device ready. Step One: Format Your External Startup Disk. Many printers and scanners use driverless technologies such as AirPrint or IPP Everywhere, which don't require additional drivers on your Mac. But third-party drivers might still be available for older devices that do require a driver. Always check for software updates before connecting the device to your Mac for the first time.
Backup important Mac data in advance: In order to avoid unexpected data loss error or problems.
diskutil apfs list (If your MacBook uses Apple File System or has a SSD)
diskutil cs list (If your MacBook doesn't use Apple File System)
If you used the first command, look for Macintosh HD in the list and check the status for FileVault. If it's still encrypting, it should give you a percentage of how much of your Mac has been encrypted. Periodically repeat this command to ensure that your Mac is actively being encrypted. When encryption is complete, the percentage should disappear. Quit Terminal and restart your Mac.
If you used the second command, scroll down to the Logical Volume Family and check the conversion status. It may or may not show you a percentage. Periodically repeat this command to ensure that your Mac is actively being encrypted. When encryption is complete, Conversion Status should report Complete. Quit Terminal and restart your Mac.
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If you authorized your Apple ID to unlock FileVault, and want to test whether you can reset your password in case you forget it, execute resetpassword in Terminal. Choose I forgot my password, and you will be guided through the steps of resetting your user account password.
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Hope this helps!