HELP ME!!! LG Magna C90 (H520G)

I am very frustrated, I have a phone LG Magna C90 (H520G) with operating Lollipop 5.0.2 system and any method of root has worked for me, I could not move or install the app on the SD card and each time the room to have the applications I need is less.

The truth is a mobile lousy, but I need some solution to get more space and to install the app that I require in my daily use.

Please if anyone can help me, I'll be very grateful.