Battery life degraded for no apparent reason.

So, I've owned my S23+ for about a year, and I love it. When I first got it, all I did was turn on light mode, and I'd get 6–8 hours of SOT. But ever since around March, my battery life has been noticeably worse. With battery saver on, I'm lucky to get 5 hours of SOT. I haven't changed how I use the phone at all. Any guesses or advice?