It sounds like you moved the things that are movable while the SD card is still "External" storage. Which is what one can normally do. Now it is possible on some devices running at least "Marshmallow" to turn the SD card into "Internal" storage rather than "External", however many manufacturers also restrict this option. I can't say on your device in particular, I can only include the instructions on how to do it. If any of the options/steps are not available on your device, then it is restricted by the manufacturer. If that is the case, then you would need to remove items off the phone (apps) and clean out your history and cache for many apps (facebook, browser, etc.,) to get yourself more room on the phone.
How to turn the "External" SD card into "Internal" storage on "Marshmallow".
NOTE: Please be sure you start with a blank SD card. It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device).
1. Go to device “Settings”, then select “Storage”.
2. Select your "SD Card", then tap the “three-dot menu“ (top-right), now select “Settings” from in there.
3. Now select “Format as internal”, and then “Erase & Format”.
4. Your SD Card will now be formatted as internal storage.
5. Reboot your phone.
NOTE: If you don't reboot the phone, many things may not work correctly, so make sure you do.
How to turn the "External" SD card into "Internal" storage on "Nougat".
IMPORTANT NOTE: Be sure you start with a blank SD card. When the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device), so anything on it prior would be gone.
1. Go to "Settings", and then select "Storage & USB".
2. At the bottom of the list you should see the SD card's details, including the option to format it and make it "Internal" storage.
3. Once this is done, reboot the device and you can start running things from the card.
If you don't reboot the phone, some things may not work correctly, so make sure you do the reboot.