I started mewing in July 2018, a few weeks ago I came across a post here that said you should make sure you are mewing correctly, I checked and I was not, only my mid and front palate was covered by my tongue and the back was left out, I fixed that issue and I'm trying now to mew with entire tongue but I have a tongue tie and I have no clue if it is stopping me from making progress or not. That's why I came here, I'm gonna attach pictures of my progress with the not so great tongue posture and my tongue.
Excellent results.