Could also try setting Preferred network type to '4G only' or if you are already using that switch to '5G' to see if this provides some improvement. Some cell carriers poorly implement their network and in some of these cases this change can help with battery use by cell network modem.
Could also see how things are if you just use wifi and no cell and the other way around. Its not just the signal strength of the connection that indicates quality of the connection. Can also be other issues in your network providers implementation.
Also there could be problems with reliability of connection elsewhere in the network. Could be the service provider having issues with their connection, wider issues eg. an undersea connection in the red sea was damaged causing major disruption to the internet, in less common cases governments even mandate disruption to connections to some services.
Molly implemented changes to the push code which improved power usage compared to Signal without Play. You could try disabling each of the apps for a few hours, in turn, to assess their impact on power usage.