Fritzing pictures and Fritzing "schematics" are barely useful. Many here will not even try to read them.
First- why so many "adjustable step down" modules. You only need one buck converter with enough power to run your 5V devices. You don't say which NRF24L01 board you are using, but all the boards I've seen have a 3.3V regulator on-board and run from 5V.
Your "schematic" as drawn won't work. All grounds should be connected together. As drawn, the data line at the base of the transistor (a MOSFET might be better) has no reference to the ground pin of the Pro Micro, so the Base-Emitter voltage will never turn on the transistor. It might see the ground through the "step-down" (whatever is in that box), but I wouldn't count on it.