Have any suggestions on killing my bad habit?

I have some potentially damaging habits that have developed over the years.

I tend to clench my teeth (nearly 24/7). I do this all throughout the day and grind them at night (I have a nightgaurd for this). I would like to stop this completely rather than simply putting some cushioning between my teeth. I have extremely sensitive teeth because of this and 3 on the left side are close to cracking. I often have quite a bit of jaw soreness and my left temporomandibular joint sometimes seems inflamed.

I’ve tried being aware of it and trying actively to change my habits to little avail.

Suggestions?