• slow charging
• wireless charging to reduce wear on the cable port, so it’s fresh if I want to sell the phone
• turn off Bluetooth when not in use
• charge only overnight with adaptive charging
• not use it too much, which I don’t need or want to
• reduce screen brightness to be only as bright as I need it to be to be able to see what I need to see
• keep an eye on applications that are open that drain battery, make sure to close them if not using them

Maybe more, can’t think of any at the moment.