How should we know why your disk is full??
I do not know !! 
I don’t understand where to find and empty the /dev/mmcblk1p2 folder
Whell first write command
df
and give us output back
ohh its df :-X
LOL 50G
du -a / | sort -n -r | head -n 20
This will give you 20 largest files.
wait for it 
as you have 50G lol
This is the result but I don’t know how to decipher it and consequently know what is or is happening
now do
ls -la /config/
do you have some docker there by any chance?
As the list have largest file/folder only 4GB
It’s something in /config/core
Try:
ls -la /config/core
Yeah but its not 49GB.
I think there is something else
4924860 is in KB or Kb
So its 4,9 GB/Gb
idont remember exactly.Nevertheless i dont think this is it
KB, and you’re right. I was off by a factor of 10.
i deleted a core file that was 4Gb in config.
I have now dropped to 89.4% disk usage but it still seems like a lot to me.
Here is the question ‘if I have any dockers?’ i can’t answer this question because i don’t understand what dockers are 
Do you have any addons?
They run in their own docker containers.
If by add-ons you mean things like floorplan, alexa, haaska wheather etc the answer is yes.
If they are in their docker containers I wouldn’t know the answer
Its hard/slow to assist if im not infront the PC 
It would also be nice to know on what kind of system this is.
I had a similar issue on my hyperv, turned out that i forgot to enable ‘auto-expand’
No those are integrations.