Don't really have a problem with the "super slow burn" as it makes for deeper and more complex characters and relationships.
Problem is, they pretty much are the same characters as 70 chapters ago with some minor realizations that had no acting upon. Finally having anything of impact happening is a godsend.
I just can't get behind that happening coming from one of the worst tropes there is, the "one MC is randomly picked up on and goes viral to an insane degree". It has been a staple (more often being a Model than Musician, tho) but it really ends up not organic and less satisfying. Her going "I want something to happen but I am not doing anything at all, where should I even start?!?" into this. It is just a bit too convenient and lame considering her willful status quo with Aya and music up to this point.
Her going bootcamping in some summer music course or uploading vids or going ham in school would be infinitely more fun. Also would stay true to her character, be actual character development and organically play into what is just asspull forced right here.
Whatever, just hope we get past every arc being "I have mental problem" -> problem gets solved -> 2 panels of face lighting up + monologue -> nothing happens and repeat.