Connecting 2 switches to single power source
Partial answer so we can knock out the easy part.
Grounds are super simple.
You do not need to run ground wires to switches if the mounting screws go through metal. Those ground via the mounting screws to the metal box.  Any ground pigtails on the switches can be capped off, as long as the switch has a metal yoke. (where the screws go).
That doesn't work for receps, unless they're &quot;self-grounding&quot;. It looks like that GFCI is self-grounding.
Therefore, all that's left to do is make sure every wire coming into the box is connected to the metal box. I see a generous 6 ground screws, so 1 per screw and you're done with grounds.