Got shell on the second container as ww******, is there a chance to privesc here ? Or that’s just a dead end ? I have tons of information, about the others containers… What they have, and how they interact with me… Got the network diagram and the files flow on my paper, the non-readable user.txt … But still stuck… Im missing something ??
Many thanks ! 
Edit:
Got Root ! What a long journey … Many thanks to everyone who helps me without any spoiler !
Every point its a new recon, take a piece of paper, write down all the networks, the interacts and the file flow… At least, for me, that helps me a lot:D
Cheers !!