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Botox injections into my overworked masseter muscles and my digastric process really helped with the muscle tightness in my experience, and continually doing the jaw exercises that my surgeon gave for me after my surgery helps me with uncomfortable clicking and cracking.
That's what helped me the best BUT I would just consult a doctor first to see what other options are out there.
Also, I use this pillow that was recommended to me by my surgeon and my atlas orthogonist and since I'm a side sleeper it has significantly improved any neck pain associated from nightly bruxism and activated neck/shoulder muscles. If you sleep on your side I was told that it's best to keep your neck even with your spine, so the pillow has different thicknesses depending on how tall/wide your shoulders are.
I really really really hope I helped. I'm so sorry your crossbite reverted after surgery.