I actually like that even after regression the MC's personality remains the same. He doesn't just change because he went back. He just comes off as rude and asocial due to his overwhelming confidence. The main difference between his previous life and the current one is that he actually puts out not just hit songs but actual emotional ones and he's expressing his feelings in the songs he is composing. His workaholic nature is the same, but he's trying to make more time for his family this time round and actually spending time with them. I like that his priority is his family and theirwell-being. Overall I really like this story.
Definitely recommend reading this.