The IR2118 doesn't seem to be hooked up correctly. Its floating high-side bootstrap pin (VB) isn't actually connected to anything -- it should be hooked up to at the least a capacitor to the VS pin, and the application diagram calls for an external diode connecting VCC to that node as well:
Right now, it has no ability to generate the boosted drive voltage for your transistor because the bootstrap supply isn't working / isn't connected correctly. Since you are using a N-channel enhancement mode device, it requires a positive VGS to function. The IR2118 driver has a floating pin (VB) which supplies the positive voltage to the MOSFET, referenced against whatever the source of the transistor is connected too:
In the typical connection diagram, thanks to the diode between VCC and VB, it's creating a simple voltage multiplier to generate the voltage needed to drive the transistor. You could also hook up some arbitrary high-voltage supply to VB.