For those who want Hiragana/Katakana practice..
Just play Splatoon/Splatoon 2 after 10:00 PM-ish EST. The Japanese players are online around that time and you can get a lot of practice reading Hiragana and Katakana.
In my experience, it's not necessarily time-bound. I've seen numerous Japanese players at 10 AM EST (though I imagine the probability of seeing Japanese greatly increases after 10 PM)
I've played at 12:00 AM EST and the chances of seeing non-Japanese players at that time are practically zero. All the names are written in Hiragana or Katakana.