Don't restore backups from your previous device. If you don't start fresh, you'll have all kinds of wakelocks and unexplained drain. Other than that, put social media apps on restricted or optimized and just use the phone. Not much really needs to be tweaked. I average 6.4%/hr screen on and 1.5%/hr screen off with a poor signal, WiFi, Bluetooth attached to my Galaxy Watch 4 Classic (which isn't connected to LTE so everything it does goes over Bluetooth), Bluetooth playing shows on VLC with the screen off at night while I'm sleeping, auto brightness on, 1080p (I don't see the point in 1440p on a display this small so I just leave it at 1080p), 5G on, using dual SIM, on full performance mode... It is a struggle for me to kill this battery in a single day unless I'm gaming heavily.