make a discord and start chatting with people over there?
comment on someone's profile?
invade someone's inbox?
try listening to groups you had never listened before?
ask people for song recommendations?
do the "like this and I´ll give you a song to listen to?"
create a quiz about "who knows me best"
write a thread about "10 things you had never known about me"
create a thread for an artist and do a proper research
ask people random questions
go into the "games section" and play a couple of games