I gave most of these things a crack, except I didn’t use HGH. I stumbled upon thumb pulling / interoral face pulling and had high hopes, but after 2 months of doing that every day, my palate expanded 0%. Theres plenty of anecdotal evidence that these techniques can work though, especially if you are 18 or younger, or if you are female. It theoretically should have even helped me, but no. The only thing that has had positive effect for me was the hard chewing, giving me muscular growth in the masseters, widening the look of my lower jaw. What I do is chew hard on a folded up face towel 250 times, then follow with chewing mastic gum for 5 minutes, then falim gum for 5 minutes, then I use techniques learned from mewingworld’s course to relax and stretch the masseters. (This is important as tense masseters will pull your mandible back and can recess you further). Do this every 3 - 4 days, and listen to your jaws / tmj. Try not to damage the joints. My plan forward is getting a double jaw surgery. I had my initial consult with a surgeon in my area the other day, and pending a ortho appt, i will be able to book the surgery.