When did you buy it? It might be still syncing.
I have SE2020, it has dog sh battery of 4 hrs SOT, but i dim the screen and it stream youtube music for 4-5 hours - yours should do double of that.
I would check your streaming quality of Apple music in settings - music. Might be also streaming big files so that adds drain. I would also activate wifi calling so that your sim call using wifi - seeking tower signal drains battery.