More details are needed.

Depending on the details there are many possibilities.

How many conduit's or cables enter this box.

For each cable/conduit what are the color of the wires. What wires connect to what wires?

What wires connect to the switch. And to what color terminals on the switch?

Is the switch part of 3 way or 3/4 way circuit.

If the only problem is "the mass of wires will be to much to screw on to the switch", then the solution is fairly easy. Use what is called a pigtail -- a short (6") piece of wire. screw one end of this to the terminal on the switch, and put the other end with those 4 wires, twist them all together, and put a wire nut onto the connection. Then push this all back into the corner of the box, out of the way, and put the switch back into the box.

But if the problem is where to connect the 4 wires, then you need to answer Bill's questions above.