Stuck on TWRP boot loop on LG G3

[Wintah]

Hi everyone! Today I rooted my phone for the first time so I obviously decided to use an old phone, one I wouldn't miss (just in case)
I downloaded and installed TWRP. After a while I was able to boot into TWRP and flash the android O emoji's I wanted to try out. I did everything and I then proceeded to reboot > System. I figured that would work, but no. It just keeps booting me back into twrp.
I've been searching online for a few hours for a fix. I came across this > https://forums.androidcentral.com/showthread.php?t=373947&p=5903637&viewfull=1#post5903637

It says to do this:

dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/fota

then hit enter

type

dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/misc

then hit enter and reboot.

I cannot do this because when I enter the first command it gives me "not enough space." What do I do in this situation ? I can't press volume up and the power button, it does nothing. I can press volume down and the power button but, of course, I get nowhere with that since I have twrp on my phone.

I really would like help on fixing this issue. Thanks in advance!

 

[anon(238680)]

Mod Note: Thread moved for better visibility.