Question regarding mewing

[anhedonia16]

Whenever I have correct tongue posture I am unable to breathe thru my nose without sounding like I am snoring. How can I fix this. And does mewing truly improve your jaw while you are still in puberty?

 

[heightmaxxing]

Get checked for a deviated septum might stop you breathing though nose

 

[anhedonia16]

Get checked for a deviated septum might stop you breathing though nose

I am able to breathe thru my nose I am just not able to do it while mewing