I've asked this question before. Now I've posted some pictures as I can't figure out where I should clean. I don't smell propane. I tired lighting manually with a lighter and nothing. I know to turn the valve on, rotate the wheel to pilot. Push in and try igniter. It worked fine 6 months ago.
If the gas main to the fireplace is on it should provide gas even if the thermocouple is bad. It is possible moisture in the line has plugged the small orifice or spiders have built a nest in that area. These are the things I usually find. The pilot is a very small flow I usually can’t hear them. Have you tried lighting with a match or lighter?
I've discovered that when lighting a gas fueled appliance (water heater) that have a button-type valve that first must be pressed down it doesn't always lite on the first try This is especially true if the shut-off valve at the tank has been off for awhile. The gas line needs to fill and the line pressure is only 2 psi.
With the dial on "pilot" push and hold the button for several seconds. Now try to lite it while still pressing the button. It may take several attempts.