I would recommend GrapheneOS too. This may not be the panacea but this is the closest OS we have to it. By default, it has zero outgoing connections except to GrapheneOS servers.
If you disable location, WiFi, Bluetooth, Network location and enable airplane mode and use VPN, your real location is not leaked.
There is no physical kill switch but I trust enough the permission system and the software based general kill switches.
About social medias, what I would do would be to use them in a browser that has content filtering (Vanadium for instance, or TOR, Ironfox, Brave, …) and/or use DNS filtering or better, a VPN with DNS block lists (IVPN Antitracker, Proton Netshield, …).
GrapheneOS is user friendly. Don’t worry for the installation process, it’s very easy. You mainly just need to unlock your bootloader, download GrapheneOS, flash it on your device, relock the bootloader.