Xposed has a module that allows you to move data / obb files to your SD card
You will need to root your phone. Luckily, the MotoG is easily rooted.
There's also probably plenty of bloaty system apps that you can either freeze and move to SD, or just uninstall.
And don't forget to clear your caches.
If you want to find out what is taking up all of the space, mount the phone to a desktop PC and use something like xdiskusage
@NotThamesWater started
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Xposed has a module that allows you to move data / obb files to your SD card
You will need to root your phone. Luckily, the MotoG is easily rooted.
There's also probably plenty of bloaty system apps that you can either freeze and move to SD, or just uninstall.
And don't forget to clear your caches.
If you want to find out what is taking up all of the space, mount the phone to a desktop PC and use something like xdiskusage