Will wearing previous orthodontic retainer affect practicing correct oral posture?

I had orthodontic treatment with braces and had 4 tooth extractions at age 7 and wisdom teeth extracted at 14 and now I'm trying to practice correct oral posture with the tongue on the roof of the mouth however my palate is narrow and I would not want the retainer to move back any expansion I may get from the tongue. All opinions are very appreciated.

No doctor answers yet