why does my phone battery drain so fast?

So I've been noticing lately that my phone battery seems to be dying way quicker than it used to. I mean, I used to go all day without needing to charge, and now it barely makes it to lunchtime. I've tried all the usual tricks like lowering the brightness, turning off Bluetooth and Wi-Fi when I'm not using them, and closing apps running in the background. But nothing seems to work. 😩 Is it just me, or has anyone else noticed their phone battery not lasting as long? Could it be because of an update or something? I'd love to hear if anyone has some tips or if it's time to just accept that I might need a new battery. Any advice or similar experiences would be super helpful!