Part numbers are a help, but really it would take examining the actual implementation detail of schematic and software to find the fault.
Consider going around and evaluating each I/Os sleep level compared to any internal or external pulling resistors.
See if you can get the radio out of the circuit entirely and measure the current without it.
Consider desoldering the accelerometer, or make sure you’ve gotten it into the right mode - I have one from another brand that consumes more current on power-on, and only hits low consumption when it’s been explicitly configured to the proper mode.