There's another problem here, which is the box is too full. I generally like to keep boxes even less crowded than allowed by code-it just makes the work easier and faster as well as safer. If you look carefully at the back of that box, it may have the cu in marked, or even the capacity in how many wires of what gauge, but there's a formula that counts how many wires terminate in the box, how many devices in the box, what gauge, etc. "Wiring Simplified" (WS) is a great, brief but complete reference, easily worth the $8 it will cost you.
I count 8 wires that look like #12, plus the ground wires, which each need 2.25 cu in. That's 20.25 cu in. Each single gang device yoke (regardless of the ampere rating of the device) counts as two conductor volumes, based on the largest conductor that terminates on the device. so with two switches, the minimal box volume is 13 x 2.25= 29.25 .
A box extension of various sorts would do the job. As other commenter noted, a conduit initiator extension would do it, or there are also exterior box extensions which are similar. The alternative is removing the box and replacing it with a bigger one, which may require a bigger hole in your wall.
And besides that, all the grounds head out of the box to some secret vacation spot. Have you found buried boxes or connections not in a box in your house? If so, get ready to redo lots of old work. Current code, if I understand it, require grounds to be connected with a wire nut or other specific connector, not just a crimp ring.
IMHO, you probably want to pull the box so you can see where everything goes, and if you do the calculation I'll bet you find they should have used a bigger box anyway. Think of it this way- you get to find out what's inside your walls!
WS will give you the essentials of electrical code, which is just physics married to common sense. In this case the relevant principles of the code are:
- All grounds in a box must be bonded together, and...
- whenever wires are bonded together, they must be in a box of adequate size...
- that's accessible for inspection and repair.