I've upgraded my Pro with a CR-Touch, WinnSinn metal dual gear extruder, BTT SKR mini E3 32 bit board, BTT TFT35 touch screen, Dual Z, Metal magnetic flex plate, Silicone Bed Stiffeners, and E3D hardened steel nozzles I also have a filament runout sensor to add
The best upgrade I made. No more moving SD cards back and forth. Adding a camera and octo everywhere takes it to another level too. I also bought a little USB light from ikea and plugged it into the raspberry pi, very useful when printing in a dark room.