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You can add something like this to your config: https://stackoverflow.com/questions/48831392/how-to-add-nixos-unstable-channel-declaratively-in-configuration-nix
You just need to have it fetch the tarball for nixos 23.11 instead of nixos unstable.
What if I just want to upgrade some packages? Like not change channel, but Firefox needs an update? I'm not op and don't use flakes btw
You can add something like this to your config: https://stackoverflow.com/questions/48831392/how-to-add-nixos-unstable-channel-declaratively-in-configuration-nix
You just need to have it fetch the tarball for nixos 23.11 instead of nixos unstable.