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You will have to uninstall apps and clear cache on instagram, facebook, and any other streaming app/service. Also move all your music, downloads, videos, pictures to an SD card.
Settings > apps > all > chrome, facebook, instagram, youtube, google music (any other music/video/media app), Clear cache > of course don't follow this instructions on whatsapp as you will lose everything, you could however, move the pictures/videos/audio to the SD card.
Do you have any pictures/videos and/or music stored on your phone?
use the file commander app > internal storage > DCIM > 100ANDRO
The easiest way to do this, open the camera app > tap on the 3 little squares (menu) > settings > data storage > SD card
then connect your phone to a PC
On your PC > Computer > there you will see Xperia Z1 Compact > Internal Storage > you could copy paste the folder DCIM from the internal storage to the SD card > then delete this folder from the internal storage
Sure thing, connect your phone to your computer > Xperia Z1 compact > whatstapp > Media > cut this folder and move it to your SD card, that way all the pictures, videos, audios will be on your SD card
If I were you, I woud do the following
Connect your phone to your computer > Xperia Z1 compact > whatstapp > copy > paste this folder on your SD card
then
onnect your phone to your computer > Xperia Z1 compact > whatstapp > media (delete this folder) > restart your phone