Hi Dave,
You may have read my 1st post, 1st mask kicking off, and here I first tried fresh sauerkraut. Nothing happened. I added cabbage twice. Nothing. In the whole batch, I had 6 (scotch bonnet) weight percent of salt added.
My second batch, used simply cabbage with the 6% salt, and seems to give excellent results. I have a feeling that it may be the temperature that plays a role. My 1st batch I made in February, at a temp of about 64 degrees (18 C), whereas for my 2nd batch I have upper 70ies.
If you don't see any gas bubbling, I would recommend not to give up. That is what I did, and although I did not see any fermentation, the smell turned sour after some weeks. And, what I produced after 6 months is excellent quality.
If I can draw a parallel with sourdough starter. The effect of temperature on sourdough starter is as follows. For temps of 20-25 C (68 - 77 degrees) the production of acetic acid is more pronounced, which gives it a stronger, more sour smell/taste. For temps above 32 C (90 degrees), you get lactic acid. For lower temps, there is little acid production.