Mosfet Amplifier design help
With the 2 MΩ and 3.9 MΩ input resistors, the time taken for the bias to set-up correctly on the gate will be approximately the parallel combination of those resistors multiplied by the input capacitance: -
$$\text{(2 MΩ || 3.9 MΩ) x 10 μF} = \text{12.9 seconds}$$
You are only running your simulation for 100 ms so you will never reach the point when the transistor starts to operate correctly. I believe LTSpice can be initialized with the capacitor pre-charged to the appropriate value (7.93 volts). You might want to do that.
Alternatively, try reducing the input capacitor to around 33 nF and watch the MOSFET spring into action a lot quicker.