I think I am actually close to solving my nasal breathing issues

Things that seem to improve it:
- Permanent Mewing 
- Thumbpulling with proper loosening of the palate and sutures beforehand
- oilpulling
- open windows for airflow during the night
- washing bedsheets every 1-2 weeks
- good healthy diet of whole foods 

Might work for you too CC and Isabelanon
I can actually breathe better already even though I have not been doing it for that long