What could be wrong with my S25 Ultra battery?

Across 3 flagships in 5 years now (S10, S21 Ultra, S25 Ultra), I've always experienced significantly lower battery life than nearly everyone else around me on the same devices.

On the S25U, I'm seeing people in this sub claiming 8 hours of SOT, even 9. I'm reporting 4.5 right now and the best I've ever had across all these phones has never exceeded 6h.

My usage is not intense - my top 3 apps are WhatsApp, Reddit and Twitter.

I understand the phone will take a week or so to learn my usage patterns but I don't expect it to double my battery life even in the best case scenario.

My conclusion therefore is that this has something to do with the apps on my phone.

Anything else it could it be?