My LG 10K has low memory

HELP! My phone LG 10K has very little apps. At one point I had more apps installed (FB, Messenger, Pinterest, Instagram, Snapchat, etc...). I then started receiving notifications I had low memory. I couldn't update, receive email, or take pictures, and was running into problems with receiving text. I have removed virtually every additional app installed a SD Card and still have problems and low memory. I've wiped out the cache and deleted anything I can think of that's extra in my File Manager. I don't have any Widgets installed, nothing on my Home screen and STILL only have very little free space.

I currently have 466 MB available out of 16GB including 4GB SD card. I mainly have the factory apps installed, some I've disabled due to low memory, and only have Snapchat, a document scanner, and 2 kid games that are additional.

The system has it uses 6.18 GB, is that normal? Snapchat only uses 543 MB, the others only 226.74 MB, my Messages 1.23 MB & Gallery is 200 KB. It says Apps are using 4.40 GB but those are mainly the system Apps.

HELP! How to I fix it to free up space to allow updates, receive emails, text and have the typical apps on my phone?