Hello. Does anybody know how can I access the World Stars chapters from 520 onwards?

I am a new member of the fandom here. Out of curiosity, I started reading the WS manga, and now I don't think I can fight the Hetalia. I've been reading from this one tumblr blog called Hetascanlations, however, I noticed that I could not access chapter 520 and onwards. So, does anybody know other alternative ways to read this? Thank you so much.