Been mewing/chin tucking since January, have gotten zero noticeable results. 20M

I started Mewing back in January and added chin tucks to my routine around the summer. I might have gotten an initial tightening of the skin around the face when I just started but looking at my progress pics have yielded zero change, same angles and everything. FWIW, I am also a bit overweight which might make seeing subtle changes difficult. No change in jaw swing, no tightening of under jaw skin, nothing. I nose breathe almost constantly, even while sleeping and rarely, if ever, mouth breathe. I did the right chewing/swallowing along with engaging my tongue correctly, yet there's still no results. Do I just wait it out and play the long game?