Please perform a search of this board and I'm confident you'll come across threads with hints and tips within that will help.
Give the phone chance to Optomise as suggested.
You'll know when this has finished as the status in Device Care and Battery will change.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.