There are several issues with your circuit, modifications attached.
1) you’ve used a 3 level MOSFET, this device requires a proper Vgs to switch on properly. I strongly recommend against using these models when you are trying to figure out if your topology is working. In your circuit I have swapped the 3 level FET with an ideal switch, once this work you can swap to more detailed switch models.
2) Time to steady state, time step and simulation clock. You need to place the simulation control in circuit. Simulate>simulation control. this is the clock element. You need to ensure that your time step is small enough (at least 20 points per cycle) and that you run the simulation long enough to hit steady state.
3) input voltage. your input voltage is initially 4.2 V you need to change this to be 2.9V
How would I get the level 3 mosfet to work? I tried a 20V input put that did. I don’t understand what I am missing in order to make the mosfet work. I need a level 3 mosfet to simulation a IC I am working on.
Can you point me to a particular video or something that will better help me understand the problem I’m failing to understand.
the parameters that you use to define the model with are very important for switching at 1.4Mhz. using these models are an unneeded complication if you are simply ensuring your converter works properly