First of all, be sure Redis is running, then run the command to enable the automatic starting at boot.
You can check the service status: sudo systemctl status redis-server
In the "Loaded" line, see if service is loaded and enabled.
In the "Active" line, see if is active and running.
This issue is only happening on Vultr and is not a Webinoly issue, some other affected users already reported this issue as solved with the latest Webinoly release, I don't really know what is happening in your specific case.
Regards.