I'd recommend swapping back to Gl.iNet actual firmware as there's another xe300 owner on the Openwrt forums having issues with WAN, they had to adjust QMI and other stuff, it's not documented on the Openwrt wiki or included in the firmware.
Link is here:
tl;Dr the Openwrt firmware is very generic and there is no easy way to set things up, you're left writing config and cron jobs to reconnect the connection when it drops.
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