I've listened to Shaj a good number of times now over the last weeks and I don't really know what they want to revamp. There's a good buildup up until the second chorus after which it relies on variations, but they're all good really. All the instrumental parts that exist are well done and especially the bass is doing interesting stuff pushing and pulling the track. Maybe the fact that all the main instrumentation is classical makes it sound old-fashioned, but I don't think this is a problem. The piano at the start is a bit twangy perhaps, they might want to clean that up a bit. Beat could be a little bit more groovy, but it's certainly not stiff as it is. I don't really think they can add anything or take anything away without making the song worse.