Psylumin

Thank you so much! I will try it out right now.
I didn't know what to do since the Miiverse settings seemed to be completely fine...
Thanks again, hopefully it will work for me too.

[Edit] Unfortunately, it didn't work. I made a new user, deleted my old default one, made another new one linked to that default nintendo ID, deleted the fake one I made, went to system settings and connected to the internet, went to miiverse and checked the settings...
... But all to no avail. Still, the only thing I can see is Nintendo default Miis running around default apps (systems settings and etc.)

Just to recap, I am connected to the internet, I can browse Miiverse and post on it, I can play my games and utilize Miiverse in them (Nintendoland shows other players, Mario lets me look at posts etc.), but my Warawara plaza only shows default apps and Miis.

Oh, and I am updated to the latest version (checked several times to make sure). Miiverse settings are set to show "All Games" on the Plaza, but no, it doesn't show anything.
I don't know what to do anymore, unfortunately... I hope that someone will find a fix!