Try this Settings > Software update > Download and install, if your device have a new update it will start to download the patch

My device is S23 Ultra and I don't have battery drain issue. To stop battery drain use power saving mode and turn off unnecessary connections like wifi, mobile data, location etc. If you can do a small research on A55 battery and get an idea about av...

When did you purchased? It will take few days for a new device to adjust to your usage patterns

Mokakda 

Your device is still learning your usage patterns, after that it will be adapted to your usage and will give optimized performance.