What a hollow story of wish fulfillment. The protagonist dreams of being a superstar, and randomly gains the power to do so. At that point there's no conflict or drama left in the series, since his stats seemingly improve by themselves (one rarely sees him train in the story), he's too overpowered for any challenges, etc.
But then we even get moments like a co-worker asking him for tips, and him replying vacuous stuff like "just do it" (since he can't say that he gained an arbitrary advantage), and at that point the story just becomes unreadable. You're supposed to cheer for this guy... why, exactly? If a character wishes to become the hero who beats the demon lord, at least they don't necessarily displace someone else from that role; but here this rando just gets to outperform and outcompete talented and hard-working characters for no reason.
There's also a separate huge problem: This story involves a lot of singing, but the author can't depict it in an interesting way, so it's 100% telling, no showing. Characters constantly say how impressed they are with the protagonist's singing, and there's an absurd focus on viewer ratings, ranking lists, view counts etc., but apart from that, one never gets the sense that he is actually doing something impressive.